Cleanup all the related code.
In particular, remove the unused handler class from file `multipart.rb`
file

Tracking issue: https://gitlab.com/gitlab-org/gitlab/-/issues/233895

Fix experiment user recording and "group type" mismatch

See merge request gitlab-org/gitlab!51468

Add namespace context for upcoming experiments

See merge request gitlab-org/gitlab!51898

Development rake task to prune hashed projects

See merge request gitlab-org/gitlab!51603

Update dependency @gitlab/ui to v25.11.3

See merge request gitlab-org/gitlab!51752

Add day based rotation to the schedule view

See merge request gitlab-org/gitlab!51330

Allow rotation assignes to be calculated
and assigned to the rotation grid from
shift times

Properly log if the tags list has been truncated

See merge request gitlab-org/gitlab!51689

Add a warning note on invalid ES cluster causing issue update errors.

See merge request gitlab-org/gitlab!51543

Add Note.url field to GraphQL

See merge request gitlab-org/gitlab!51811

Use swimlanes sidebar for group boards [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!51480

Add new Jira Connect app modal and button with groups listing

See merge request gitlab-org/gitlab!51061

And import all styles which will be used by child
components

3 experiments: remove known fields, trimmed skip trial copy and trial
registration with social signin.

Redirect deprecated profile paths to scoped path

See merge request gitlab-org/gitlab!51646

Redirect previously deprecated profile paths to the new scoped /-/
routes.

Add OncallShifts read service and specs

See merge request gitlab-org/gitlab!50135

Add handlers for Jira connect error responses

See merge request gitlab-org/gitlab!51738

Decouple GitLab Pages legacy deployment from zip deployment

See merge request gitlab-org/gitlab!50678

Incoming mail - Rename G Suite to Google Workspace

See merge request gitlab-org/gitlab!51837

Remove canary deployment callout

See merge request gitlab-org/gitlab!51297

This uses Gitlab.config to establish the root, and simplifies the
method of finding orphans.

Output messages are made more informative.

Backfill projects in Elasticsearch when transferred

See merge request gitlab-org/gitlab!51717

The new sidebar will be used when either epic swimlane is used
or 'graphql_board_lists` FF is turned on.

List all hostnames used when loading GitLab.com

See merge request gitlab-org/gitlab!51850

Extend creating HTTP Integration mutation with custom mapping attributes

See merge request gitlab-org/gitlab!50860

Add `payload_example` and `payload_attribute_mapping` arguments
to the create HTTP integration GraphQL mutation.

The feature is available with the GitLab Premium license.

This adds `gitlab:storage:prune_hashed_projects`, which removes
directories not associated with any known project.

This is a development-only task, and must be run with `FORCE=1` to
actually perform the deletions.

Remove EE references from FOSS view [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!51832

Add ability to filter by admins in the /users API endpoint

See merge request gitlab-org/gitlab!46244

Also, fix specs for UserType.

Merge branch 'qmnguyen0711/795-ratelimit-reset-header-from-rackattack-differs-from-that-returned-by-haproxy' into 'master'

Convert RateLimit-Reset header format to Unix time

See merge request gitlab-org/gitlab!51680

Fix not skipped manual and delayed DAG jobs

See merge request gitlab-org/gitlab!50765

When we fixed this bug for when:on_success jobs, we did not include
manual and delayed jobs. This commit fixes it.

This is behind a FF skip_dag_manual_and_delayed_jobs

Geo: Sync expired artifacts

See merge request gitlab-org/gitlab!51541

Simplify findList and removeList functions in board store

See merge request gitlab-org/gitlab!51685

Fix minor class name typo

See merge request gitlab-org/gitlab!51858