Document code design of approval rules

See merge request gitlab-org/gitlab!29679

In this development document, major parts of the application being
used to implement the approval rules feature is explained in a
high level manner.

The goal is to help contributors understand the code design easier
and to also help those familiar with the codebase to see if there
are parts to improve.

This doesn't document the entire feature yet as it's missing other
parts specified in the TODO section of the document.

Make batch suggestions an alpha feature

See merge request gitlab-org/gitlab!34831

As it was put behind a feature flag, default to false.

Use GpgKeys::CreateService when a user creates gpg keys for themselves via the API

See merge request gitlab-org/gitlab!34817

Use `GpgKeys::CreateService` when an admin creates a new gpg key for a user

See merge request gitlab-org/gitlab!34737

Show validation error if link creation fails

See merge request gitlab-org/gitlab!33638

When link creation fails due to validation error, then
an exception is raised and no reasonable error is displayed to
the user.

With this change we:
* try creating all links
* gather all errors and return them in the response

Add link to account limits

See merge request gitlab-org/gitlab!34422

Add tooltips to JUnit report test

See merge request gitlab-org/gitlab!29076

Fix documentation of resource milestone events api

See merge request gitlab-org/gitlab!34625

Update pinned links to use GlButton

See merge request gitlab-org/gitlab!34620

We are updating the pinned link component to use an
abstraction to remove duplicate HTML and
abstract strings to constants.

Assign plan_id when building a new plan limit

See merge request gitlab-org/gitlab!34845

Using `PlanLimits.new` fails because the `plan_id` FK is not set.
We were also directing users to use `Plan.default.limits` which can be
nil if there are no limit records.

Update dependency @gitlab/ui to v17.1.0

See merge request gitlab-org/gitlab!34849

Add explanation about ApprovalWrappedRule

See merge request gitlab-org/gitlab!34822

Added link to cloud deploy images

See merge request gitlab-org/gitlab!34624

Add default .com job archival notes

See merge request gitlab-org/gitlab!33718

Correction in DAG Pipeline Documentation for needs keyword

See merge request gitlab-org/gitlab!34781

Merge branch '219121-resolve-the-need-for-disabling-redundant-check-in-haml-templates' into 'master'

Resolve the need for disabling redundant check in haml templates

Closes #219121

See merge request gitlab-org/gitlab!34860

Replace SafeLink Component with GlLink

Closes #216040

See merge request gitlab-org/gitlab!31083

This change would deprecate the SafeLink component and
use the default feature of GlLink which now does the
same job as SafeLink

Clarify use IAM profile feature docs

See merge request gitlab-org/gitlab!34705

Add column to ci_builds_metadata to store secrets

See merge request gitlab-org/gitlab!34480

Docs: Added shared runner minutes

See merge request gitlab-org/gitlab!34799

Move `reset_alerting_token` route spec from EE to CE

See merge request gitlab-org/gitlab!34731

Add docs for common's logutil within secure integration docs

See merge request gitlab-org/gitlab!34356