Docs: add overview and use cases for Jenkins integration

Closes #3012

See merge request !2524

Update the mirror delay to something that's valid in controller spec

See merge request !2520

Fixes alignments and strokes in mini graph for pipeline

Closes #2971

See merge request !2506

[ci skip]

[ci skip]

Fixed issue boards focus mode when new navigation is turned on

Closes gitlab-ce#35449

See merge request !2502

Namespace license checks for Repository Mirrors

Closes #2577

See merge request !2328

Update the elasticsearch image we use

Closes #2277

See merge request !1741

The `members` table can have entries where `user_id: nil`, because people can
invite group members by email. We never want to include those as members,
because it might cause confusion with the anonymous (logged out) user.

Add /duplicate quick action

See merge request !2505

Add license check before enabling DB load balancing

Closes #2850

See merge request !2448

Migrate Geo logs to structured JSON in geo.log

See merge request !2482

Ensure rebuild authorized_keys works

Closes #2883

See merge request !2508

Load the sessionscontroller after loading the ldap strategies

Closes #35447

See merge request !13049

Adds lower bound to pull mirror scheduling feature

See merge request !2366

Fixed issue boards sidebar close button with new navigation

Closes #35296

See merge request !12991

Otherwise the token might be cleared before authentication is
done, causing the authentication itself to fail

CE Upstream - Monday

Closes gitlab-ce#15582

See merge request !2504

fix resize bug for title and collapsible nav menus

Closes #35156

See merge request !12904

Resolve "Lazy load images on the Frontend"

Closes #34361

See merge request !12503

Resolve "Error 500 viewing notes with anonymous user"

Closes #35444

See merge request !13037

Add warning, and provide the option to enable “Write to authorized_keys file” setting within the rake task.

Use `match_array` rather than `eq` in ProjectsFinder spec

Closes #35489

See merge request !13052