Reduce amount of locks needed for GitHub importer

Closes #54270 and #51817

See merge request gitlab-org/gitlab-ce!24102

Add GitLab Pages predefined variables

See merge request gitlab-org/gitlab-ce!24504

Backport button style changes to CE

See merge request gitlab-org/gitlab-ce!24609

Btn group secure group dashboard

See merge request gitlab-org/gitlab-ee!9220

Fix sporadic spec failure on return order of approval rules

See merge request gitlab-org/gitlab-ee!9327

Fix typo: Prometheus Metrics

See merge request gitlab-org/gitlab-ce!24344

EE Port: Fix typo: Prometheus Metrics

See merge request gitlab-org/gitlab-ee!9335

Removes duplicated cluster show partials

See merge request gitlab-org/gitlab-ce!24654

Quarantine diff patch spec

See merge request gitlab-org/gitlab-ce!24769

After the import has finished, we flush (delete) the InternalId records
related to the project at hand. This means we're starting over with
tracking correct internal id values, a new record will be created
automatically when the next internal id is generated.

The GitHub importer assigns iid values by using supplied values from
GitHub. We skip tracking internal id values during the import in favor
of higher concurrency. Deleting any InternalId records after the import
has finished is an extra measure to guarantee consistency.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/54270.

This reverts commit fb98496f.

This reverts commit b78a69b0.

This reverts commit 358675d0.

See: https://gitlab.com/gitlab-org/quality/nightly/issues/42
Also failing in staging until the fix is picked into the next release:
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/24533

Externalize strings from `/app/views/projects/milestones`

See merge request gitlab-org/gitlab-ce!24726

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Externalize strings from `/app/views/projects/milestones`

See merge request gitlab-org/gitlab-ee!9320

Update dependency @gitlab/svgs to ^1.48.0

See merge request gitlab-org/gitlab-ce!24744

Port of 50352-sort-save

See merge request gitlab-org/gitlab-ee!9219

Save sorting preference for Issues/MRs in BE

Closes #50352

See merge request gitlab-org/gitlab-ce!24198

Externalize strings from `/app/views/clusters`

See merge request gitlab-org/gitlab-ce!24666

Document how to format localized dates in Ruby

Closes #41237

See merge request gitlab-org/gitlab-ce!24585

[Part 5] Add support for Parent Epic in Epic sidebar

See merge request gitlab-org/gitlab-ee!9318