SSoT audit fixes for some topics in GitLab U section

Closes #61513

See merge request gitlab-org/gitlab-ce!29033

Also improves the markdown in that section.

Remove some deprecated code

See merge request gitlab-org/gitlab-ce!29222

Notify events when auto merge is enabled or merge param is updated

See merge request gitlab-org/gitlab-ce!29415

Fix UTF-8 conversion issues when resolving conflicts

Closes #63062

See merge request gitlab-org/gitlab-ce!29453

[CE] use `retry_on_exception` instead of duplicating code

See merge request gitlab-org/gitlab-ce!29452

Remove extra word on Health Check page

See merge request gitlab-org/gitlab-ce!29390

Improve details about acceptable number of unicorn workers

See merge request gitlab-org/gitlab-ce!28262

Edit "SCIM Setup" for SSOT

See merge request gitlab-org/gitlab-ce!29313

Use `retry_on_exception` instead of duplicating code

Allow references to labels and milestones to contain emoji

Closes #37762, #53756, and #40728

See merge request gitlab-org/gitlab-ce!29284

Similar to https://gitlab.com/gitlab-org/gitlab-ce/issues/63030,
when the commit message in the /resolve_conflicts endpoint contains a
UTF-8 character, the conversion to the Gitaly ASCII-8BIT value may flag
an error. To fix this, we run `force_encoding` on the commit message.

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/63062

Merge branch '61510-review-and-update-the-security-doc-pages-to-adhere-to-ssot-standards-docs' into 'master'

SSoT - Security doc pages

Closes #61510

See merge request gitlab-org/gitlab-ce!29357

Handle encoding errors for MergeToRefService

See merge request gitlab-org/gitlab-ce!29440

Add word break style to branch name in dropdown

Closes #62154

See merge request gitlab-org/gitlab-ce!29069

Add change log

User link styling for commits

Closes #61072

See merge request gitlab-org/gitlab-ce!29150

Move project default git depth behind feature flags

Closes #62906

See merge request gitlab-org/gitlab-ce!29346

Avoid DB timeouts when scheduling migrations

Closes #63036

See merge request gitlab-org/gitlab-ce!29437

Add puma killer observer

Closes #63037

See merge request gitlab-org/gitlab-ce!28992

PumaWorkerKiller is used for periodically checking and killing
workers (the biggest one) if overall memory reaches specified
limit. This metric allows us to watch number of killed workers.

Fix nil coercion updating storage size on project statistics

See merge request gitlab-org/gitlab-ce!29425

Cancel Auto Merge when target branch is changed

See merge request gitlab-org/gitlab-ce!29416

Use grid and correct border radius for status badge

See merge request gitlab-org/gitlab-ce!29420

Add docs for linking to external dashboard

Closes #57171

See merge request gitlab-org/gitlab-ce!27950

- To user/project/operations
- And cross-link in ci/environments

When target branch is updated, Auto Merge should be canceled.

Fix border radius of collapse discussion btn

See merge request gitlab-org/gitlab-ce!29217

Video links for SSoT audit

See merge request gitlab-org/gitlab-ce!29400

Turn avatar-counter into a mixin with optional border-radius

Adding labels to note event payload.

Closes #33064

See merge request gitlab-org/gitlab-ce!29384