Resolve "Notes API for issues no longer returns label additions/removals"

Closes #39461

See merge request gitlab-org/gitlab-ce!15080

Resolve "TagsPage|Tags"

Closes #40367

See merge request gitlab-org/gitlab-ce!15512

Batch load blobs for diff generation

Closes #37599

See merge request gitlab-org/gitlab-ce!15370

Fix promoting milestone updating all issuables without milestone

Closes #40337

See merge request gitlab-org/gitlab-ce!15487

After installing a new gem, batch-loader, a construct can be used to
queue data to be fetched in bulk. The gem was also introduced in both
gitlab-org/gitlab-ce!14680 and gitlab-org/gitlab-ce!14846, but those mrs
are not merged yet.

For the generation of diffs, both the old blob and the new blob need to
be loaded. This for every file in the diff, too. Now we collect all
these so we do 1 fetch. Three `.allow_n_plus_1_calls` have been removed,
which I expect to be valid, but this needs to be confirmed by a full CI
run.

Possibly closes:
- https://gitlab.com/gitlab-org/gitlab-ce/issues/37445
- https://gitlab.com/gitlab-org/gitlab-ce/issues/37599
- https://gitlab.com/gitlab-org/gitlab-ce/issues/37431

Fix slow gitaly dev test bundle

See merge request gitlab-org/gitlab-ce!15508

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

Export code as ES6 modules

See merge request gitlab-org/gitlab-ce!15503

Backport ability to enable/disable file attachments in issuable form

See merge request gitlab-org/gitlab-ce!15433

Memoize GitlabShellAdapter for performance and ease of testing

See merge request gitlab-org/gitlab-ce!15507

Fix commits list 500 with multi-file editor new_repo cookie

Closes #39821

See merge request gitlab-org/gitlab-ce!15502

Remove a useless `allow_failure: no` and use `true` instead of `yes`

See merge request gitlab-org/gitlab-ce!15491

Port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3463#note_47990536

Update gRPC to v1.7.2

Closes gitaly#742

See merge request gitlab-org/gitlab-ce!15439

Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/39821

/<namespace>/<project>/commmits/master

remove the rake task `gitlab:sidekiq:drop_post_receive`

Closes #40290

See merge request gitlab-org/gitlab-ce!15493

Fix merge_requests.source_project_id migration

See merge request gitlab-org/gitlab-ce!15496

[CE] Impersonation no longer gets stuck on password change.

Closes #13888

See merge request gitlab-org/gitlab-ce!15497

Add inline editing to issues on mobile

Closes #39497

See merge request gitlab-org/gitlab-ce!15438

Align retry button with job title with new grid size

Closes #40342

See merge request gitlab-org/gitlab-ce!15462

Fix bitbucket wiki import with hashed storage enabled

Closes #40292

See merge request gitlab-org/gitlab-ce!15490

improve requirements details

See merge request gitlab-org/gitlab-ce!15265

[ci skip]

Clarify wording of protected branch settings for the default branch

See merge request gitlab-org/gitlab-ce!15492

We need to make sure merge_requests.source_project_id allows NULL values
_before_ updating rows as otherwise this will lead to a NOT NULL
constraint failing.

Make Issue Boards sidebar subscriptions async

Closes #39167 and #40094

See merge request gitlab-org/gitlab-ce!15364

Implement a workaround for QA mattermost failures

Closes gitlab-qa#102

See merge request gitlab-org/gitlab-ce!15486

This task is no longer being used and is not documented.

Remove pretty time from main.js

See merge request gitlab-org/gitlab-ce!15459