Add PG trigger to maintain `projects.has_external_wiki`

See merge request gitlab-org/gitlab!49916

We cache whether a project has an External Wiki integration enabled in
the `has_external_wiki` column on `projects`. It will be `TRUE` if the
project has the "External Wiki" integration (service) enabled.

This was previously maintained with application code.

This cache is easy to fall out of consistency when we fail to maintain
it during bulk operations (including PostgreSQL cascading deletes
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/48163/) as
mentioned in:

- https://gitlab.com/gitlab-org/gitlab/-/issues/273574#note_457006686
- https://gitlab.com/gitlab-org/gitlab/-/issues/289798

As Ecosystem is increasingly changing integration data using bulk
operations this has been changed to be maintained through a PostgreSQL
trigger.

https://gitlab.com/gitlab-org/gitlab/-/issues/290715
https://gitlab.com/gitlab-org/gitlab/-/issues/289798

Release Highlights Linter

See merge request gitlab-org/gitlab!48851

Remove extra space from graphql enum

See merge request gitlab-org/gitlab!51304

Move Group Migration entities import to individual sidekiq jobs

See merge request gitlab-org/gitlab!50781

Updated broken link

See merge request gitlab-org/gitlab!51404

Fixed broken link

See merge request gitlab-org/gitlab!51405

Use package settings to validate Maven packages

See merge request gitlab-org/gitlab!50691

Use the namespace_package_settings values for Maven
packages to evaluate if duplicate packages are allowed
to be created.

Expose hide_backlog_list and hide_closed_list to project and group boards REST API

See merge request gitlab-org/gitlab!49815

The corresponding WebUI is already in Core.

Secret detection no run on tag

See merge request gitlab-org/gitlab!51129

Fix fork icon shrinks if branch name is very long

See merge request gitlab-org/gitlab!50915

Limit member tribute autocomplete to 10

See merge request gitlab-org/gitlab!51122

Link LB section to available reference architectures

See merge request gitlab-org/gitlab!51418

Add GraphQL mutation to export Requirements

See merge request gitlab-org/gitlab!50546

Fix component option order in test_case_list

See merge request gitlab-org/gitlab!51375

Fix component option order in incidents

See merge request gitlab-org/gitlab!51364

Fix component option order in registry

See merge request gitlab-org/gitlab!51372

Fix component option order in environments

See merge request gitlab-org/gitlab!51362

Fix line classes and unified diff components

See merge request gitlab-org/gitlab!51203

Fix component option order in snippets

See merge request gitlab-org/gitlab!51374

Fix component option order in analytics

See merge request gitlab-org/gitlab!51357

[RUN ALL RSPEC] Use the last non-block arg for cop

See merge request gitlab-org/gitlab!51276

Indent child form elements in integrations form

See merge request gitlab-org/gitlab!50929

Fix component option order in alert_management

See merge request gitlab-org/gitlab!51355

Merge branch 'mwaw/296169-usage-data-hll-count-for-estimate_batch_distinct_count-outside-expected-error-range' into 'master'

Use fixed dataset in estimate_batch_distinct_count test suite to avoid flaky test results

See merge request gitlab-org/gitlab!51207

Reduce heading font size in validate CI lint page

See merge request gitlab-org/gitlab!51042

Fix component option order in test_case_show

See merge request gitlab-org/gitlab!51376

In Ruby, the explicit block argument is special, and for our case cannot
be converted into a keyword argument. The argument we want instead is
the last non-block argument.

Fix component option order in oncall_schedules

See merge request gitlab-org/gitlab!51367

Auto refresh SAML connection after 7 day timeout

See merge request gitlab-org/gitlab!50914

Auto redirect to provider

Fix component option order in billings

See merge request gitlab-org/gitlab!51358

Limit Group Migration extractors and loaders to 1 per pipeline

See merge request gitlab-org/gitlab!50951