* master: (67 commits)
  Documentation: Frontend Building Checklist
  Fix a documentation typo for GitLab pages
  Refactored activity calendar
  Respect visibility options and description when importing project from template
  Resolve "Improve tooltips of collapsed sidebars"
  Update Container Scanning documentation
  Fix typo in vue.md
  Fix specifying a non-default ref when requesting an archive using the legacy URL
  Fix direct_upload when records with null file_store are used
  Upgrading gitlab-gollum-lib and rouge
  Check Gitaly when running `rake dev:setup`
  Update ProjectStatistics#build_artifacts_size synchronously without summing (#41059)
  Fix label links update on project transfer
  Resolve "Get rid of branch element all in bottom bar in WEB IDE"
  Rename #qa slack channel to #quality in docs
  Resolve "Show `failure_reason` in jobs view content section"
  Fix N+1 queries when loading participants for a commit note
  [Rails5] Fix `User#manageable_groups`
  [Rails5] Avoid type casting in uniqueness validator
  Add index to file_store on ci_job_artifacts
  ...

Fix a documentation typo for GitLab pages

Closes #45568

See merge request gitlab-org/gitlab-ce!18489

Documentation: Frontend Building Checklist

See merge request gitlab-org/gitlab-ce!18394

Refactored activity calendar

See merge request gitlab-org/gitlab-ce!18469

Rename #qa slack channel to #quality in docs

See merge request gitlab-org/gitlab-ce!18472

Check Gitaly when running `rake dev:setup`

See merge request gitlab-org/gitlab-ce!18481

Respect visibility options and description when importing project from template

Closes #42601

See merge request gitlab-org/gitlab-ce!18473

Resolve "Improve tooltips of collapsed sidebars"

Closes #25010 et #44272

See merge request gitlab-org/gitlab-ce!17714

Define priority label for bugs

See merge request gitlab-org/gitlab-ce!18361

Update Container Scanning documentation

Closes #45543

See merge request gitlab-org/gitlab-ce!18479

Resolve "Geo: Statement timeout counting local job artifacts"

Closes #45476

See merge request gitlab-org/gitlab-ce!18444

Fix specifying a non-default ref when requesting an archive using the legacy URL

Closes #45507

See merge request gitlab-org/gitlab-ce!18468

edit GitLab license info so that GitHub recognizes it

See merge request gitlab-org/gitlab-ce!18291

Fix N+1 queries when loading participants for a commit note

Closes #45526

See merge request gitlab-org/gitlab-ce!18471

[Rails5] Fix `User#manageable_groups`

See merge request gitlab-org/gitlab-ce!18330

Fix typo in vue.md

See merge request gitlab-org/gitlab-ce!18411

Fixed IDE diff markers being cached too long

See merge request gitlab-org/gitlab-ce!18311

Added staged files state to IDE

Closes #44842, #44844, and gitlab-ee#4541

See merge request gitlab-org/gitlab-ce!17898

Fix direct_upload for old records

See merge request gitlab-org/gitlab-ce!18360

Old records have a null value of file_store column.
This causes the problems with current direct_upload implementation,
as this makes it to choose Store::REMOTE instead of Store::LOCAL.

This change moves the store save when change saving the object.

Upgrading gitlab-gollum-lib and rouge

See merge request gitlab-org/gitlab-ce!18436

Resolve "Calculating total size of a project's CI artifacts"

Closes #41059

See merge request gitlab-org/gitlab-ce!17839

[Rails5] Avoid type casting in uniqueness validator

See merge request gitlab-org/gitlab-ce!18470

Before this change, trying to setup dev environment could be tried
without having at least one Gitaly running. Cloning the repositories
would fail, but not stop the setup.

Given this would lead to an inconsistent state, a check was added if we
could connect to the server.

Output when it fails:

```
$ rake dev:setup
Failed to connect to Gitaly...
Error: 14:Connect Failed
```

Previously we scheduled a worker to just some this but we were running
into performance issues when the build table was getting too large. So
now we've updated the code such that this column is updated immediately
and incremented/decremented by the correct amount whenever artifacts are
created or deleted.

We've also added the performance optimization that we do not update this
statistic if a project is deleted because it could result in many
updates for a project with many builds.

Fix label links update on project transfer

Closes #44158

See merge request gitlab-org/gitlab-ce!18320