Support `/merge` slash command for MRs

Closes #24915

See merge request !7746

Use cached values to compute total issues count in milestone index pages

See merge request !8518

Do not show artifacts keep button if not allowed

Closes #26357

See merge request !8501

Show 'too many changes' message for merge request

Closes #25017

See merge request !8444

Mark Commits as persisted

See merge request !8604

Switch to sassc-rails

Closes #18432

See merge request !8556

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

Closes #18432

This uses sassc to compile the application's SASS so it compiles faster.

Without attempting to be very scientific here are some numbers I got:

Using sassc-rails:

```
[1] pry(main)> Benchmark.bm { |bm| bm.report { Rails.application.assets["application.css"] } }
       user     system      total        real
   1.430000   0.380000   1.810000 (  1.830753)
```

Using sass-rails:
```
[1] pry(main)> Benchmark.bm { |bm| bm.report { Rails.application.assets["application.css"] } }
       user     system      total        real
  12.320000   0.530000  12.850000 ( 12.909684)
```

The result is faster page loads when changing CSS in development and
faster precompilation.

Remove rerun since it's not used anymore

Closes #19633

See merge request !8598

Synchronize all project authorization refreshing work using a lease

Closes #25987

See merge request !8599

Fixed random issue boards sidebar failure

Closes #26751

See merge request !8602

Update ffaker to ~>2.4 to avoid generating names with suffixes

Closes #26492

See merge request !8596

Previously a lease would only be obtained to update data. This could
lead to duplicate data being inserted, triggering a UNIQUE constraint
error. To work around this we now acquire a lease before performing
_any_ project authorization work, releasing it at the very end.

Fixes #25987

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

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

Fix search group/project filtering to show results

Closes #26616

See merge request !8565

Pipeline Index Mini Graph Fix

See merge request !8542

Ensure updating project settings shows a flash message on success

See merge request !8579

Resolve "Add Hover animations"

Closes #26207

See merge request !8415

Retain original casing for  build name in manual pipeline dropdown

Closes #25946

See merge request !8387

Yet another dot git migration fix

See merge request !8592

Remove Lock Icon on Protected Tag

Closes #22111

See merge request !8513

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

Fix issue with diff comments path

See merge request !7819

Remove margin on mobile links

Fix migration failing when user has no projects

See merge request !8589

* master: (579 commits)

Conflicts:
	spec/models/build_spec.rb

- Fixed typo
- Fixed migration when there are no projects and path is nil
- Added path rollback that was missing if there was a SQL error

Fix a API deprecation warning

See merge request !8587