expose metrics in merge request api

Closes #41905

See merge request gitlab-org/gitlab-ce!16589

Removes webpack bundle tag for two factor auth js

See merge request gitlab-org/gitlab-ce!17330

Remove protected branches webpack bundle tag

See merge request gitlab-org/gitlab-ce!17374

Slack notifications - Respect "Notify only default branch" for push events

Closes #33570

See merge request gitlab-org/gitlab-ce!17345

Update incoming emails documents

See merge request gitlab-org/gitlab-ce!17481

Resolve "Update language about usage ping in admin settings"

Closes #43548

See merge request gitlab-org/gitlab-ce!17468

Fetch commit signatures from Gitaly in batches

Closes gitaly#1046

See merge request gitlab-org/gitlab-ce!17456

Support additional LabelsFinder parameters for group labels

See merge request gitlab-org/gitlab-ce!17447

Because epic index page includes also epics from subgroups
it's necessary to also get descendant group labels for filtering.
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/4773#note_61236542

Allow CI/CD Jobs being grouped on version strings

See merge request gitlab-org/gitlab-ce!17455

In some situations (listing labels for epics) we want to
list only group ancestor labels, this is already supported
in LabelsFinder we just need to enable additional parameters.

Also `set_issuables_index` method now loads project labels only if
@project is set (which is not used for epic group labels).

Update documentation WRT to request parameters

See merge request gitlab-org/gitlab-ce!17469

Extend Cluster Applications to install GitLab Runner to Kubernetes cluster

Closes #32831

See merge request gitlab-org/gitlab-ce!17134

Remove registry list webpack entry point

See merge request gitlab-org/gitlab-ce!17459

Remove trailing newline that was causing an EE conflict

See merge request gitlab-org/gitlab-ce!17465

Add some strings that were missing in gitlab.pot

See merge request gitlab-org/gitlab-ce!17467

Small fixes in Vuex docs

See merge request gitlab-org/gitlab-ce!17471

Remove u2f webpack bundle

See merge request gitlab-org/gitlab-ce!17435

Remove blob viewer bundles

See merge request gitlab-org/gitlab-ce!17446

Moved o_auth/saml/ldap modules under gitlab/auth

See merge request gitlab-org/gitlab-ce!17359

Resolve "Include cycle time in usage ping"

Closes #41777

See merge request gitlab-org/gitlab-ce!16793

Display ingress IP address in the Kubernetes page

See merge request gitlab-org/gitlab-ce!17052

Closes gitaly#1046