Resolve "Unable to rebase unapproved merge request"

Closes #2753

See merge request !2273

Detect Geo secondary role properly in spec/support/db_cleaner.rb

See merge request !2282

Return `nil` when user is not found by email.

Closes #2769

See merge request !2289

Add CE-to-EE guide for 9.3

See merge request !2254

Perform Geo::RepositorySyncService for dirty projects

See merge request !2130

Geo - Fix path_with_namespace for instances of Geo::DeletedProject

Closes #2726

See merge request !2267

Move shared examples to their correct location and remove duplicates

Closes #2759

See merge request !2281

Introduce unified docs to EE landing page

See merge request !2265

Otherwise the sync would crash, causing all later users not being synced.

Marked Geo as alpha

See merge request !2287

[ci skip]

[ci skip]

[ci skip]

Fix GitLab check: Problem with Elastic Search

Closes #2757

See merge request !2278

Empty repository mirror no longer creates master branch with README automatically

Closes #2425

See merge request !2276

Add License check for Burndown Charts

Closes #2578

See merge request !2219

Resolve "LDAP group link select dropdown error"

Closes #2762

See merge request !2277

Namespace license checks for fast-forward merge (EES)

Closes #2572

See merge request !2272

Add CE-to-EE guide for 9.3

See merge request !2101