Move logic of obtaining Issuable data to separate method

Fix inconsistent pagination styles

Closes #58194

See merge request gitlab-org/gitlab-ce!25552

Fix pagination and duplicate requests in environments page

Closes #58191

See merge request gitlab-org/gitlab-ce!25582

Makes the Web IDE the default editor

Closes #42382

See merge request gitlab-org/gitlab-ce!25171

Move gfm_autocomplete_spec.rb out of quarantine

Closes #57995 and #56843

See merge request gitlab-org/gitlab-ce!25542

Resolve "Add keybinding for next/previous file in merge request diff"

See merge request gitlab-org/gitlab-ce!25355

Mousetrap is used as the help-tool to listen to keystrokes

Added currentDiffIndex getter to store that holds
the index of currently active diff file in the list

Instead of computing it on the component, we will take advantage of it
being available for all components in DiffsApp

Testing keyboard navigation and jumpToFile()

Persist source sha and target sha for merge pipelines

See merge request gitlab-org/gitlab-ce!25417

Quarantine failing push_mirroring_over_http_spec

See merge request gitlab-org/gitlab-ce!25590

source_sha and target_sha are used for merge request pipelines

Added permissions section to issue template [CE]

See merge request gitlab-org/gitlab-ce!25576

Update operations settings breadcrumb trail

Closes #56387

See merge request gitlab-org/gitlab-ce!25539

Elaborate on POSTGRES_VERSION Auto DevOps setting

See merge request gitlab-org/gitlab-ce!25579

Add documentation on upgrading GitLab HA nodes

Closes #58121

See merge request gitlab-org/gitlab-ce!25574

This commit fixes two problems:

1. When a user clicked on another page, the app would fetch the new page
data but never update because the request and response parameters failed
to match the isEqual check. This was happening because the JSON response
omitted the `nested` attribute, so there was a comparison with a `null`
value.  We fix this by scrubbing undefined values before doing the
comparison.

2. There were duplicate requests made for the environments page because
the success handler of fetchPipelines() would cause the polling
component to make another XHR request.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58191

API: Promote project milestone to a group milestone

Closes #53861

See merge request gitlab-org/gitlab-ce!25203

Added: Specs for the API action

As mentioned in
https://gitlab.com/gitlab-org/gitlab-ce/issues/58121#note_145299901, it
wasn't obvious that upgrading an GitLab HA cluster required special
care. Link to the Omnibus documentation for upgrade instructions.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/58121

Remove N+1 query for tags in /admin/runners page

See merge request gitlab-org/gitlab-ce!25572

As discussed in https://github.com/mbleigh/acts-as-taggable-on/issues/91,
we can avoid N+1 queries if we use `tags` instead of `tag_list`.

Seen while reviewing
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/19740.

update persona links issue template

See merge request gitlab-org/gitlab-ce!25560

Add name_without_type to environments.json

See merge request gitlab-org/gitlab-ce!25492

It's needed to show shorter names in environments "folders"

Revert "Merge branch '56726-fix-n+1-in-issues-and-merge-requests-api' into 'master'"

See merge request gitlab-org/gitlab-ce!25570

Fix ETag caching not being used for AJAX requests

Closes #57905

See merge request gitlab-org/gitlab-ce!25400

This reverts merge request !25042

Revert "Merge branch '13784-simple-masking-of-protected-variables-in-logs' into 'master'"

See merge request gitlab-org/gitlab-ce!25566

This reverts merge request !25293

Fix N+1 query in Issues and MergeRequest API when issuable_metadata presense

See merge request gitlab-org/gitlab-ce!25042

Move logic of obtaining Issuable data to separate method