This requires a few things to be true:

1. Database connections are opened during routes. This is true for the
   GitLab application. Note this is not allowed anymore in Rails 7.
2. Multiple databases are configured. With a single database, Rails has
   always accidentally closed the database connection for the main
   database.

This fix removes prior attempts to drop the connection(s)

Database connections opened in other initializers are still an issue but
Rails kindly closes them for us. Unfortunately Rails has an initializer,
set_routes_reloader_hook which is run _after_ `config.after_initialize`.
The sequence goes like this:

1. Various initializers run, including route loading.
1. `config.after_initialize` blocks run (called by
   Gitlab::Application.finisher_hook). One of the
   `config.after_initialize` blocks run is to close all database
   connections.
1. `Gitlab::Application.set_routes_reloader_hook` initializer runs. This
   loads routes again.

So this fix is simple: we simply call the same thing Rails to close all
database connections again.

Make OmniAuth initializer return Geo proxied URL when it exists

See merge request gitlab-org/gitlab!82703

OmniAuth full_host supports a proc, this makes it return a proc
that changes based on the env to verify whether it's a proxied
Geo request or not.

For regular requests, or non-EE requests, this keeps returning
the base URL, while proxied Geo requests return the URL of the
proxying site - to get SSO working with separate URLs.

EE: true
Changelog: changed

Migrate admin email checkboxes to gitlab-ui

See merge request gitlab-org/gitlab!84759

Use release check command in FF rollout issue

See merge request gitlab-org/gitlab!85258

Fix rendering failure for the 'Verified' badge

See merge request gitlab-org/gitlab!84862

Changelog: fixed

Add keyboard HTML tag to markdown page

See merge request gitlab-org/gitlab!85216

Fix order-dependent failure

See merge request gitlab-org/gitlab!85341

Docs: Add expected behaviour for updating users managed by LDAP

See merge request gitlab-org/gitlab!84767

Add consequences of updating user email in LDAP

Docs: Note 14.7-14.9 can have Gitaly /tmp bug

See merge request gitlab-org/gitlab!85329

The following issue has been wide-spread among our customers, so this
commit adds mention of it in the upgrade docs:
https://gitlab.com/gitlab-org/gitaly/-/issues/4113

Add name change note to markdown.md

See merge request gitlab-org/gitlab!85187

Document typePolicies and makeVar usage in frontend

See merge request gitlab-org/gitlab!84740

This change adds information on how to use typePolicies and makeVar to
maintain a local state using Apollo Client 3.

Replace 15.0 with 16.0 for self-monitoring removal

See merge request gitlab-org/gitlab!85344

spec/tasks/dev_rake_spec.rb spec/tasks/gitlab/setup_rake_spec.rb

The latter spec fails because the former spec does not reset the env
var.

Update NFS Support deprecation

See merge request gitlab-org/gitlab!85217

Document _IMAGE_SUFFIX variable for API Security

See merge request gitlab-org/gitlab!85220

Doc | Add authentication section to Release Links API

See merge request gitlab-org/gitlab!84054

doc: Add SAST_IMAGE_SUFFIX to SAST docs

See merge request gitlab-org/gitlab!85271

chore: Migrate performance bar settings checkboxes to GitLab UI

See merge request gitlab-org/gitlab!84801

Document partitioning tables for Database Dictionary

See merge request gitlab-org/gitlab!85331

Add a CI/CD Template for deploying Shopify Themes with Theme Kit

See merge request gitlab-org/gitlab!52279

Update auto-deploy-image to v2.23.0

See merge request gitlab-org/gitlab!85214

SAST docs: Add Semgrep-based Java scanning for 14.10

See merge request gitlab-org/gitlab!85246

This table was dropped in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/82215

Change variant to confirm for open repository button

See merge request gitlab-org/gitlab!84763

Update links to CI/CD docs

See merge request gitlab-org/gitlab!85308

Refactor E2E testcase linting

See merge request gitlab-org/gitlab!84218

Replaces 2 e2e testcase cops with a more comprehensive script.
Adds a check for missing testcases.

Fix doc wording for GLFM specification dev guide

See merge request gitlab-org/gitlab!85326