Add QA selector to 'New label' button on empty labels page

Rewrite SnippetsFinder to improve performance

Closes #52639

See merge request gitlab-org/gitlab-ce!22606

Bump Gitaly to 0.129.0

See merge request gitlab-org/gitlab-ce!22868

Enhance performance of counting local Uploads

Closes gitlab-ee#6070

See merge request gitlab-org/gitlab-ce!22522

Comment on any expanded diff line on MRs

See merge request gitlab-org/gitlab-ce!22398

Copy changes for abuse clarity

Closes #51589

See merge request gitlab-org/gitlab-ce!22148

(EE Port) Assign approvers based on code owners

See merge request gitlab-org/gitlab-ce!22513

Fix broken link to Vagrant box

See merge request gitlab-org/gitlab-ce!22859

Resolve "`parallel` job keyword MVC"

Closes #21480

See merge request gitlab-org/gitlab-ce!22631

Now the files are identical again compared to EE.

These are backported from
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/5050

Add an index to the `store` column on `uploads`. This makes counting
local uploads faster.

Also, there is no longer need to check for objects with `store = NULL`.
See https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/18557

---

### Query plans

Query:

```sql
SELECT COUNT(*)
FROM "uploads"
WHERE ("uploads"."store" = ? OR "uploads"."store" IS NULL)
```

#### Without index

```
gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                  QUERY PLAN
---------------------------------------------------------------------------------------------------------------
 Seq Scan on uploads  (cost=0.00..601729.54 rows=578 width=272) (actual time=6.170..2308.256 rows=545 loops=1)
   Filter: ((store = 1) OR (store IS NULL))
   Rows Removed by Filter: 4411957
 Planning time: 38.652 ms
 Execution time: 2308.454 ms
(5 rows)
```

#### Add index

```
gitlabhq_production=# create index uploads_tmp1 on uploads (store);
CREATE INDEX
```

#### With index

```
gitlabhq_production=# EXPLAIN ANALYZE SELECT uploads.* FROM uploads WHERE (uploads.store = 1 OR uploads.store IS NULL);
                                                          QUERY PLAN
-------------------------------------------------------------------------------------------------------------------------------
 Bitmap Heap Scan on uploads  (cost=11.46..1238.88 rows=574 width=272) (actual time=0.155..0.577 rows=545 loops=1)
   Recheck Cond: ((store = 1) OR (store IS NULL))
   Heap Blocks: exact=217
   ->  BitmapOr  (cost=11.46..11.46 rows=574 width=0) (actual time=0.116..0.116 rows=0 loops=1)
         ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..8.74 rows=574 width=0) (actual time=0.095..0.095 rows=545 loops=1)
               Index Cond: (store = 1)
         ->  Bitmap Index Scan on uploads_tmp1  (cost=0.00..2.44 rows=1 width=0) (actual time=0.020..0.020 rows=0 loops=1)
               Index Cond: (store IS NULL)
 Planning time: 0.274 ms
 Execution time: 0.637 ms
(10 rows)
```

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/6070

Add dynamic timer to delayed jobs

See merge request gitlab-org/gitlab-ce!22382

Fix links to product features

See merge request gitlab-org/gitlab-ce!22860

Remove gitlab-ui loading icon from global

See merge request gitlab-org/gitlab-ce!22724

Re-implemented image commenting on diffs

Closes #48956

See merge request gitlab-org/gitlab-ce!22443

Merge branch '52771-ldap-users-can-t-choose-private-or-internal-when-creating-a-new-group' into 'master'

Fix new group visibility form for non-admins

Closes #52771

See merge request gitlab-org/gitlab-ce!22468

CE port: Remove instance autocomplete_service variable

See merge request gitlab-org/gitlab-ce!22847

Update issue_workflow.md: team labels

See merge request gitlab-org/gitlab-ce!22800

CI/CD coverage docs: fix pytest-cov regex

Closes #48613

See merge request gitlab-org/gitlab-ce!22842

Fix bug with wiki page create message

Closes #50890

See merge request gitlab-org/gitlab-ce!22849

Fix statement timeouts in RemoveRestrictedTodos migration

Closes #52649

See merge request gitlab-org/gitlab-ce!22795

Use merge request prefix symbol in event feed title

Closes #36267

See merge request gitlab-org/gitlab-ce!22449

Add a helper method to append path to a base URL

See merge request gitlab-org/gitlab-ce!22854

Little typo in markdown.md

See merge request gitlab-org/gitlab-ce!22851

In Ruby 2.4, `URI.join("http://test//", "a").to_s` will
remove the double slash, however it's not the case in
Ruby 2.5. Using chomp should work better for the intention,
as we're not trying to allow things like ../ or / paths
resolution.

This helper method append path to host, making sure
there's one single slash as path separator.