Internal API changes to decouple redis from Shell

Closes gitaly#520

See merge request !13971

Clean up projects API docs

See merge request !14071

Wait for gitaly to boot during tests

See merge request !14051

Merge branch 'AshleyDumaine/gitlab-ce-36994-toggle-for-automatically-collapsing-outdated-diff-comments' into 'master'

Add setting to collapse outdated diff comments on push

Closes #36994

See merge request !14053

Improve Import/Export memory use and performance

Closes #35389 and #26556

See merge request !13957

Enable auto-retry in GitLab CI/CD pipeline

Closes #37281

See merge request !14033

Update PROCESS.md to point to retro and kickoff info

See merge request !14059

Merge branch '19650-remove-admin-section-from-search-results-if-user-doesnt-have-access' into 'master'

Hide admin link from default search results for non-admins

Closes #19650

See merge request !14015

Clean up new navigation templates

See merge request !13983

Fix wrong API status codes

See merge request !14069

Resolve "Update the docs for GPG for gpg2 - [secret key not available]"

Closes #36859

See merge request !14024

Update 'Visibility of pipelines'

Closes #34360

See merge request !13948

Move Incoming Email checks to System Checks

See merge request !14028

Use flexbox for prometheus graph row grouping instead of bootstrap classes

See merge request !14006

Optimize Groups::GroupMembersController#create

Closes #27374

See merge request !13825

Migrate old issues without author to the ghost user

Closes #36860

See merge request !13860

Enable all gitaly features in spinach tests

Closes gitaly#521

See merge request !14043