Since we're prepending the ActiveRecord::Extension module, we
can take advantage of it and avoid using an alias to extend the
original #attributes method.

It's not needed anymore as we require `#cache_key` instead.

This commit also includes some changes in specs to use
`Class.new` approach.

This allows using `CacheMarkdownField` for models that are not backed
by ActiveRecord.

When the including class inherits `ActiveRecord::Base` we include
`Gitlab::MarkdownCache::ActiveRecord::Extension`. This will cause the
markdown fields to be rendered and the generated HTML stored in a
`<field>_html` attribute on the record. We also store the version
used for generating the markdown.

All other classes that include this model will include the
`Gitlab::MarkdownCache::Redis::Extension`. This add the `<field>_html`
attributes to that model and will generate the html in them. The
generated HTML will be cached in redis under the key
`markdown_cache:<class>:<id>`. The class this included in must
therefore respond to `id`.

add info about runner server requirements

See merge request gitlab-org/gitlab-ce!25242

Also another factor of consideration for
runner server requirements.

Docs: Update all links to relative in /workflow and /administration

See merge request gitlab-org/gitlab-ce!28971

(CE Port) New user onboarding (Skeleton)

See merge request gitlab-org/gitlab-ce!28753

- Render EE specific partial if exists

SSoT - Clean up docs under install/

Closes #61509

See merge request gitlab-org/gitlab-ce!28688

Fix `SyntaxError: Unexpected token` in SAST jobs

See merge request gitlab-org/gitlab-ce!29156

Fix "operation settings external dashboard component" Jest specs

See merge request gitlab-org/gitlab-ce!29160

Port: EE adjust burndown chart opened issues count

See merge request gitlab-org/gitlab-ce!28777

Jestify some specs that start with "A"

See merge request gitlab-org/gitlab-ce!28727

Resolve "Charts with many overlapping series display incorrectly"

Closes #61045

See merge request gitlab-org/gitlab-ce!29127

Adds ruby and unicorn instrumentation

Closes #61964

See merge request gitlab-org/gitlab-ce!28499

Connect Frontend and backend for external dashboard link

Closes #61453

See merge request gitlab-org/gitlab-ce!28431

Connect frontend UI with backend api for external dashboard link

Bump up @gitlab/eslint-config dependency version to 1.6.0

See merge request gitlab-org/gitlab-ce!29147

The helper was needed because `jest.spyOn` would not
work on this special window object property. The only way
we could successfully spy on `localStorage` was with this helper.

Bump Helm version in Auto-DevOps.gitlab-ci.yml

See merge request gitlab-org/gitlab-ce!28527

[ci skip]

[ci skip]

Extract setIssueDetail() into issue boards store

See merge request gitlab-org/gitlab-ce!29071

Update GITALY_SERVER_VERSION to 1.45.0

See merge request gitlab-org/gitlab-ce!29109

Fix warning in spec from committing unused mutation

See merge request gitlab-org/gitlab-ce!28815

Fix MR checkboxes alignment on mobile

Closes #57037

See merge request gitlab-org/gitlab-ce!28845

Extract toggleFilter() into issue boards store

See merge request gitlab-org/gitlab-ce!29083

Adjustments related to DiffNotes on diffs outside of a project's main repository

See merge request gitlab-org/gitlab-ce!29023

Update rendering of merge request in merge request widget

Closes #40246

See merge request gitlab-org/gitlab-ce!28238

Increase height of move issue dropdown

See merge request gitlab-org/gitlab-ce!29087