Document matching refs with an at-symbol

See merge request gitlab-org/gitlab-ce!26755

At-symbols are used to match a ref to a specific repository path.
Currently this is done by string splitting the ref pattern on the
at-symbol. In order to pattern match a literal `@` you must use
ruby's unicode character matching `\u{0040}`.

Fix format typo on generate-new-recovery-codes-using-ssh

See merge request gitlab-org/gitlab-ce!26819

Fix typo on tests style guide

See merge request gitlab-org/gitlab-ce!26859

Resolve "Set the size of instance system message text 12px"

Closes #59131

See merge request gitlab-org/gitlab-ce!26293

Update dependency @gitlab/svgs to ^1.58.0

See merge request gitlab-org/gitlab-ce!26881

Use the default fetch/clone depth for the review-deploy job

See merge request gitlab-org/gitlab-ce!26868

Remove non-functional add issue button on welcome list

Closes #55980

See merge request gitlab-org/gitlab-ce!26742

Revert "Monitor GraphQL with Prometheus"

See merge request gitlab-org/gitlab-ce!26864

This reverts merge request !26569

Docs: revamp/reorg CI variables

Closes #58626

See merge request gitlab-org/gitlab-ce!26336

- Variables overview
- Variables triggered via manual pipeline

Remove ignore column for PersonalAccessToken#token

Closes #53411

See merge request gitlab-org/gitlab-ce!25213

Add dashboard scope for operations dashboard usage ping

See merge request gitlab-org/gitlab-ce!26727

[CE] Reduce diff with EE in `spec/models`

See merge request gitlab-org/gitlab-ce!26847

Remove groups destroy race condition spec

See merge request gitlab-org/gitlab-ce!26851

Cache FindCommit results in pipelines view

See merge request gitlab-org/gitlab-ce!26776

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

Docs: image realignment

See merge request gitlab-org/gitlab-ce!26799

Docs: move variables reference to its own doc

See merge request gitlab-org/gitlab-ce!26763

Pull master

Stop calling UnlinkRepositoryFromObjectPool RPC

Closes #59777

See merge request gitlab-org/gitlab-ce!26821

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/59777.

In earlier iterations of our implementation of Git object deduplication
we thought we would be making extensive use of Git remotes in pool
repositories in the future, and that we should manage these remotes
carefully from the start. We now expect we only care about one remote,
namely the source project. The other remotes are there only for forensic
purposes.

Before this MR we tried to also remove pool remotes when member projects
got deleted, with the UnlinkRepositoryFromObjectPool RPC. This is
fragile when there are race conditions (see
https://gitlab.com/gitlab-org/gitaly/issues/1568#note_153955926). We
have spent some time making this RPC less fragile in
https://gitlab.com/gitlab-org/gitaly/merge_requests/1151 but looking at
this problem again, I think we should just stop calling it.

Jarv/dev to gitlab 2019 04 02

Closes #2810

See merge request gitlab-org/gitlab-ce!26846

Document `click_` vs. `go_to_` standard for e2e tests

Closes #59645

See merge request gitlab-org/gitlab-ce!26825

Backport: Expose merge request pipeline parameters for MR widget

See merge request gitlab-org/gitlab-ce!26826

Fixed positioning of the diff tree list on mobile

Closes #59739

See merge request gitlab-org/gitlab-ce!26820

For each pipeline, the controller will call `Pipeline#latest?` to
determine if the pipeline's ref is the latest for that branch.
Since it's likely that the same branches are being used in each
pipeline, we can reduce Gitaly overhead by caching the results
of the FindCommit call.

Backport splitting approval changes from CE

See merge request gitlab-org/gitlab-ce!26323

Author and committers approvals are split in EE
This commit provides backports for those changes

This reverts commit 886f00bc.

Adds documentation about the utility classes

See merge request gitlab-org/gitlab-ce!26824

Fixed expand full file button showing on images

Closes #59695

See merge request gitlab-org/gitlab-ce!26830