Handle orphans when removing soft deleted groups

This fixes the migration from https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7528 so it handles orphans as mentioned in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7528/diffs#note_18800962.

This needs to go in 8.14.0 as otherwise customers may run into the same problem.

See merge request !7657

Add new image for Cycle Analytics

See merge request !7666

Add concern for reuse pagination params declaration in API

Closes #23532

See merge request !7646

[ci skip]

Revert "Merge branch 'docs/jira-old' into 'master'"

See merge request !7531

There may be more tables but these were the tables that were problematic
for GitLab.com due to foreign key constraints (without cascading
deletes).

Improve readability of environments table

## What does this MR do?
Fix the environments table columns width

## Before
![Screen_Shot_2016-11-21_at_18.13.00](/uploads/1771b0546eb3cb15f4894b719fd44286/Screen_Shot_2016-11-21_at_18.13.00.png)

## After
![Screen_Shot_2016-11-21_at_18.11.18](/uploads/a20194a055b6ec0f7989f0c1499883d3/Screen_Shot_2016-11-21_at_18.11.18.png)
## Does this MR meet the acceptance criteria?

- [ ] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [ ] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [ ] API support added
- Tests
  - [ ] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [ ] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

See merge request !7628

Add help section for MM commands

## What should this MR do

Check @pedroms' design for the Mattermost service screen: https://gitlab.com/gitlab-org/gitlab-ce/issues/22540

Now this has to be implemented, I've created a clean canvas for you, @lbennett, to draw on.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- Tests
  - [x] Added for this feature/bug
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

See merge request !7558

External jobs do not have show page nor traces

Fixes #24677

See merge request !7617

Avoid helper call with default parameters

The helpers can ultimately be removed when the issue API uses the Grape DSL.

See merge request !7649

This reverts merge request !7365

Add Approve and Remove approval to UX Guide terminology table

Updating UX Guide page on terminology to include guidance on 'Approve' and 'Remove approval'.

See merge request !7632

fixed manage_large_binaries_with_git_lfs.md typo

See merge request !7612

add missing sudo skip-auto-migration

## What does this MR do?

Fixes minor documentation issue where adding `skip-auto-migration` file does not work because `sudo` is not used.

See merge request !7435

Change docker backup command in readme

See the general Documentation guidelines http://docs.gitlab.com/ce/development/doc_styleguide.html

## What does this MR do?

MR fixes wrong order of parameters in the command given for backing up gitlab in a docker container

## Moving docs to a new location?

No

See merge request !7468

Add example image to pipelines docs

See merge request !7652

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/24767

[ci skip]

Object state models docs

Object state models docs for issues and merge requests.

This is to start documenting object models, focused more on users and how they experience the product.

See merge request !7544

Docs on Mattermost commands

Still needs some screenshots, depends on: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7558

/cc @ayufan @SeanPackham

See merge request !7567

[ci skip]

Preserve optional second parameter in NewNoteWorker jobs
    
Closes #24678

See merge request !7602

Fix undefined error in CI linter

## What does this MR do?

This MR fixes undefined error in CI linter.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] Tests added for this feature/bug
  
## What are the relevant issue numbers?

Closes #24759

See merge request !7650

Remove unnecessary require_relative calls from service classes.

See merge request !7601

Add node_modules cache to npm related builds

See merge request !7548

Rails by default use autoload for all dirs from app folder.
require_relative not needed. See ActiveSupport::Dependencies.autoload_paths

Fix StrongAttibutes error with Ruby 2.1

Closes #24730

See merge request !7625

https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7617#note_18762971

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7617#note_18763033

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7617#note_18762721

Feedback:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7617#note_18762989

Backport SmartInterval, PrettyTime, SubbableResource from EE.

## What does this MR do?

Backports infrastructure used for EE-only Timetracking so it can be used and improved upon in CE. 

This doesn't really need review... it was already reviewed and merged in EE. 

There are no side effects or conflicts, just three new classes added:

1. `SubbableResource` -- pubsub for ajax resources
2. `SmartInterval`-- for configurable polling
3. `PrettyTime` -- time parsing and formatting utility methods

- [x] Added for this feature/bug
- [x] All builds are passing
- [x] Conform by the [merge request performance guides](http://docs.gitlab.com/ce/development/merge_request_performance_guidelines.html)
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)
- [x] Branch has no merge conflicts with `master` (if it does - rebase it please)
- [x] [Squashed related commits together](https://git-scm.com/book/en/Git-Tools-Rewriting-History#Squashing-Commits)

## What are the relevant issue numbers?

https://gitlab.com/gitlab-org/gitlab-ee/issues/985

https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/870

cc: @jschatz1

See merge request !7573