Move the first half of the GitOps page from an external repository
to the development documentation. The second half of the page
discusses an architectural implementation that doesn't yet exist,
so I didn't add it.

Switch Search Elasticsearch index to use default english stemmer

See merge request gitlab-org/gitlab!48518

Update Vue and related dependencies

See merge request gitlab-org/gitlab!46125

Avoid the use of Elasticsearch joins when searching for issues

See merge request gitlab-org/gitlab!48583

This mirrors what happens with any new index. All migrations should be
marked as having finished as soon as the new index is created.

docs: Correct static analysis tiering in Auto-Devops docs

See merge request gitlab-org/gitlab!49494

Updates Auto-SAST and Auto-Secret-Detection to correctly
list tiering availability in core and mr widget in ultimate

Disable future tense rule on paragraph

See merge request gitlab-org/gitlab!49529

Predefined CI variables for the dependency proxy

See merge request gitlab-org/gitlab!49133

Add the following predefined environment variables:

- CI_DEPENDENCY_PROXY_USER
- CI_DEPENDENCY_PROXY_PASSWORD
- CI_DEPENDENCY_PROXY_HOST
- CI_DEPENDENCY_PROXY_GROUP_URL

Remove future tense from the Front End guide's Vuex section

See merge request gitlab-org/gitlab!49524

Remove future tense from the Front End guide's Performance section

See merge request gitlab-org/gitlab!49521

This paragraph contains one of the few truly valid
uses of future tense, so it shouldn't be flagged.

Add section to the dependency proxy docs detailing CI authentication

See merge request gitlab-org/gitlab!49514

Add sourcegraph feature flag yml

See merge request gitlab-org/gitlab!49442

Add note about npm package names requiring scope higher up in docs

See merge request gitlab-org/gitlab!49404

Revise subheadings about tiers

See merge request gitlab-org/gitlab!49286

More revision of the style guide to reduce wordiness and simplify
language.

Add basic state management to Jira Connect Vue app

See merge request gitlab-org/gitlab!48750

Add service to create Oncall-rotation

See merge request gitlab-org/gitlab!49194

Replace popover with the Glpopover

See merge request gitlab-org/gitlab!49035

Merge branch '283932-flaky-test-qa-specs-features-ee-browser_ui-2_plan-epic-epics_management_spec-rb-39-plan' into 'master'

Move `.js-epic-container` class to fix E2E spec

See merge request gitlab-org/gitlab!49150

`.js-epic-container` was being added to multiple elements which was
causing JS errors

Resolve "DevOps Adoption MVC (backend)"

See merge request gitlab-org/gitlab!48684

Geo: Recover stuck verification started rows

See merge request gitlab-org/gitlab!48006

Follow-up !47131 Apply style guideline

See merge request gitlab-org/gitlab!49496

Disable epic quick actions for new epics

See merge request gitlab-org/gitlab!49470

- Add options to service description

Add specs too

Move CSS to page related bundle

See merge request gitlab-org/gitlab!48792