Display slash commands outcome when previewing Markdown

Closes #21531

See merge request !10054

Resolve "Documentation: Frontend list of do's and don'ts"

Closes #31552

See merge request !11091

Add a manual job to trigger package build in omnibus

Closes omnibus-gitlab#2234

See merge request !11086

Update design of auth error page

Closes #29145

See merge request !11099

Remove # char for commit

Closes #31810

See merge request !11093

Internationalise Cycle Analytics page

Closes #28433

See merge request !10669

Conflicts:
	lib/gitlab/cycle_analytics/review_stage.rb
	lib/gitlab/cycle_analytics/staging_stage.rb
	lib/gitlab/cycle_analytics/test_stage.rb

Fix wording of Cycle Analytics stage legends

See merge request !11106

Port of "2274-store-last-repository-updated-at" to CE

See merge request !11085

Resolve "Web GUI: Unable to create new branch from commit SHA"

Closes #30329

See merge request !10738

Fix MR target branch select dropdown placement cut-off

Closes #31271

See merge request !10902

Deploy keys load async

Closes #29667

See merge request !10973

Reject EE reserved namespace paths in CE as well

Closes #31800

See merge request !11095

Include the bundler:audit job into the static-analysis job

Closes #31824

See merge request !11092

Add enableMap to gl.GfmAutoComplete for partial re-use --  EE backport

See merge request !11073

Add tooltips to note action buttons

Closes #31760

See merge request !11082

Remove slash commands from Markdown preview and display their outcome next to
the text field.
Introduce new "explanation" block to our slash commands DSL.
Introduce optional "parse_params" block to slash commands DSL that allows to
process a parameter before it is passed to "explanation" or "command" blocks.
Pass path for previewing Markdown as "data" attribute instead of setting
a variable on "window".

Use blob viewer for job artifacts

Closes #31297

See merge request !11018

Fixed tags sort dropdown being empty

Closes #31618

See merge request !11055

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