Fix error 500s creating new projects due to empty weights

Closes #225203

See merge request gitlab-org/gitlab!35829

Change the project_id index to be unique on vulnerability_statistics

See merge request gitlab-org/gitlab!35861

Fix existing repository_storages_weighted migrations

Closes #225588

See merge request gitlab-org/gitlab!35814

GitLab 13.1.0 added the
`application_settings.repository_storages_weighted` column, but it was
possible that the value was not seeded properly due to a stale schema
cache due to the use of ActiveRecord inside the migrations. Admins that
upgraded might see 500 errors when creating projects.

To ensure that the data is seeded properly, we surgically add a
migration that seeds the data only if it is not present. The schema
version was intentionally used to avoid backporting conflicts and to
ensure any background migrations will have the correct data when they
run. The changes were largely taken from
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/35814.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/225203

Fix file permissions

See merge request gitlab-org/gitlab!35880

Resolve "Need a way to ensure all newly created paid groups are indexed"

See merge request gitlab-org/gitlab!35172

Create a new ElasticsearchIndexedNamespace object
when GitlabSubscription objects are created/updated
to paid, hosted plans. Trials are not included but
will be indexed if updated to a non-trial paid plan.

Fix note formatting

See merge request gitlab-org/gitlab!35918

Clarify Gitaly mixed configuration details

See merge request gitlab-org/gitlab!35717

Edit ordering_table_columns.md, move important info first

See merge request gitlab-org/gitlab!35811

Merge branch 'mwaw/208224-move-cluster-health-feature-into-gitlab-core-BE-prometheus-proxy' into 'master'

Extract Metrics Prometheus API proxy logic into shared module

See merge request gitlab-org/gitlab!35606

Documentation: Add note about executor for managed cluster apps

See merge request gitlab-org/gitlab!35906

Remove users.ghost ignore statement

Closes #219004

See merge request gitlab-org/gitlab!35621

Stop writing to update_at on audit_events

See merge request gitlab-org/gitlab!35697

Update Auto DevOps auto-build-image to v0.3.0

See merge request gitlab-org/gitlab!35662

Adds the ability to override the default Dockerfile path via the
DOCKERFILE_PATH CI variable.

- Upstream change: https://gitlab.com/gitlab-org/cluster-integration/auto-build-image/-/merge_requests/47
- Feature request: https://gitlab.com/gitlab-org/gitlab/-/issues/212211

Don't error on wrong MR IID in changelog for cherry pick MRs

See merge request gitlab-org/gitlab!35252

Docs: tone and style edits

See merge request gitlab-org/gitlab!35809

Touching up the pages to bring them closer to GitLab standards.

For instances that upgraded to GitLab 13.1.x, it's likely that the
`application_settings.repository_storages_weighted` column did not
properly update. This happened because the schema for
`ApplicationSetting` may have been cached, so the newly-added column
wasn't visible to the model.

To ensure the column always has the right data, we make the
pre-deployment migration fill in the right data and flush the
cache. This essentially does the same thing as the post-deployment
migration, but it ensures that the application can properly run before
post-deployment migrations have completed.

Closes https://gitlab.com/gitlab-org/gitlab/-/issues/225588

Revert "Merge branch 'add-bin-feature-flag' into 'introduce-feature-flag-definition'"

See merge request gitlab-org/gitlab!35910

Specify "immediate parent group" as appropriate

Closes gitlab-org/manage/general-discussion#15798

See merge request gitlab-org/gitlab!35461

This reverts merge request !35540

Update ListService to use Alert Management Alerts for last_firing_events

See merge request gitlab-org/gitlab!35482

Use `default_branch_name` when initializing w/README.md

See merge request gitlab-org/gitlab!35801

Merge branch '222313-update-usage-ping-data-to-track-projects-with-can-override-approvals-in-merge-request' into 'master'

Update usage ping data to track projects with overridden approval rules

See merge request gitlab-org/gitlab!35224

Refactor CI variable modal

Closes #214638

See merge request gitlab-org/gitlab!35353

Refactor modal to not mutate
vuex state but use a two way
computed property to disptach
actions and commit mutations to
update state.