Move workhorse files into final directory

See merge request gitlab-org/gitlab!84115

Preserve the files themselves, though I'm taking out the directory
structure as part of the move. We don't need these files in three
different subfolders. The bigger issue is getting them into the
doc/development directory, where they can be linted and counted.

Switch to v-safe-html for Markdown Fields

See merge request gitlab-org/gitlab!84463

Remove announcement from Source Code

See merge request gitlab-org/gitlab!84524

Add documentation for instance setting to enable shared runners

See merge request gitlab-org/gitlab!84383

Reduce compile size of notify_enhanced

See merge request gitlab-org/gitlab!84430

Add search keyboard shortcut for merge requests to docs

See merge request gitlab-org/gitlab!84601

Move manual iteration management EOL to 16.0

See merge request gitlab-org/gitlab!84529

Deprecate manual iteration management post

See merge request gitlab-org/gitlab!83892

Fix iteration dates adding timezone offset

See merge request gitlab-org/gitlab!84432

Document iteration reference

See merge request gitlab-org/gitlab!84560

Remove jest test callbacks from API specs

See merge request gitlab-org/gitlab!84482

Refactor sortablejs related constants and utils

See merge request gitlab-org/gitlab!84497

Move sortable_default_options.js to ~/sortable and rename
the files to constants.js and utils.js to follow the
convention in the codebase

Also delete unused issuable_title.vue component

ci: Reduce duplication in the default CI image names

See merge request gitlab-org/gitlab!83944

Skip remove resources after QA unit tests

See merge request gitlab-org/gitlab!84538

Merge branch '357367-show-quick-actions-in-referenced-commands-field-for-previewing-markdown-when-editing-issue' into 'master'

Quick actions in `referenced-commands` when editing issue descriptions

See merge request gitlab-org/gitlab!84053

Changelog: fixed

Fix unable to autoload constant

See merge request gitlab-org/gitlab!84273

Update service ping local setup instructions

See merge request gitlab-org/gitlab!84591

Polish Jira issue fields UI

See merge request gitlab-org/gitlab!84353

Resolve avatar size in commit item

See merge request gitlab-org/gitlab!84412

Swap parts of feature flag doc doc

See merge request gitlab-org/gitlab!84505

Refactor runner registration specs

See merge request gitlab-org/gitlab!84280

Move pipeline specs from 6_release/ to 4_verify/

See merge request gitlab-org/gitlab!84507

Move Layout/SpaceInsideBlockBraces into separate TODO file

See merge request gitlab-org/gitlab!84577

Enable Rails/Presence in Rubocop for HAML

See merge request gitlab-org/gitlab!59600

Move Lint/BinaryOperatorWithIdenticalOperands into separate TODO file

See merge request gitlab-org/gitlab!84458

Update RelationExportService to not perform export if relation is recently exported

See merge request gitlab-org/gitlab!84207

Add information about PostgreSQL 12.7

See merge request gitlab-org/gitlab!84125

docs: Update supported OS

See merge request gitlab-org/gitlab!84603

Add resolve thread to permission table

See merge request gitlab-org/gitlab!84598