Speed up Project security access specs

Prior, every single test was creating four `ProjectMember` objects, each
of which created one `User` record, even though each test only used
_one_ of those Users, if any.

Now each test only creates the single user record it needs, if it needs
one. This shaves minutes off of each spec file changed here.

EE version of https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7779

See merge request !919

Prior, every single test was creating four `ProjectMember` objects, each
of which created one `User` record, even though each test only used
_one_ of those Users, if any.

Now each test only creates the single user record it needs, if it needs
one. This shaves minutes off of each spec file changed here.

CE upstream

See merge request !912

[ci skip]

[ci skip]

[ci skip]

[ci skip]

Port of rephrase-system-notes to EE

See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7692

See merge request !913

Fix StrongAttibutes error with Ruby 2.1

Similarly to gitlab-org/gitlab-ce!7625

See merge request !909

You can only assign default_branch when editing a project

Related to https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7726

See merge request !7741

You can only assign default_branch when editing a project or when creating a project for a specified user [ci skip]

You can only assign default_branch when editing a project [ci skip]

changes environment.last_deployment to a try expression so it does not fail if e…

## What does this MR do?

Fixes the call on `environment.last_deployment` to not break when `environment`is not yet set.

## Does this MR meet the acceptance criteria?

- [x] [Changelog entry](https://docs.gitlab.com/ce/development/changelog.html) added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md)
- [x] API support added
- Tests
  - [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?


Closes #24779

See merge request !7671

Don't convert data which already is the target type

With Grape's DSL we already enforce data types. We don't need to explicitly convert to string if there is already one.

See merge request !7740

Signed-off-by: Rémy Coutable <remy@rymai.me>

Move admin spam spinach test to RSpec

See merge request !7708

Merge branch '24908-install-instructions-seem-to-have-two-database-steps-out-of-order' into 'master'

Fix documentation to create the `pg_trm` extension before creating the DB

Closes #24908

See merge request !7735

Add missing documentation.

## What does this MR do?

Add documentation to Build events on webhooks

See merge request !7717

Add default_branch attr to Project API payload in docs.

See merge request !7726

Document that we always use `do...end` for `before` in RSpec

[ci skip]

See merge request !7697

Change wording in JIRA doc so that redirect in
the docs portal will work.

See merge request !908

Add missing JIRA file that redirects to the new location

See merge request !7736

[ci skip]

[ci skip]

[ci skip]

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

[ci skip]
Signed-off-by: Rémy Coutable <remy@rymai.me>

Backport Note#commands_changes from EE

One small thing from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/870 that was missed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/7604.

/cc @rdavila

See merge request !7730

Log mv_namespace parameters

[ci skip]

See merge request !7729

Add nested groups support to the routing

## What does this MR do?

It allows routing with `/` in namespace name 

## Why was this MR needed?

For nested groups feature(https://gitlab.com/gitlab-org/gitlab-ce/issues/2772). We need URI like `/group/subgroup/project` be routed correctly


## Does this MR meet the acceptance criteria?

- [x] [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
  - [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-ce/issues/2772

See merge request !7459

Move admin abuse report spinach test to RSpec

https://gitlab.com/gitlab-org/gitlab-ce/issues/23036

See merge request !7691