Permit symbols when loading mail_room.yml

See merge request gitlab-org/gitlab!62780

The `YAML.safe_load` changes made by
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/58042
broke the diagnostic rake task gitlab:incoming_email:check
due to use of symbols for keys inside the ERB template
file `config/mail_room.yml`.

This change adds an exclusion permitting loading of
Symbol classes when parsing the YAML syntax for this
specific file.

Fixes https://gitlab.com/gitlab-org/gitlab/-/issues/331683

Changelog: fixed

Use shorter URLs without utf8 parameters (Issue/MR templates)

See merge request gitlab-org/gitlab!62824

Include branch name(s) in "is invalid" alert

See merge request gitlab-org/gitlab!62380

Update dependency dompurify to ^2.2.9

See merge request gitlab-org/gitlab!62916

Revise intro text for integrations, admin area

See merge request gitlab-org/gitlab!62624

Fix Migrate project VSA navigation to path navigation [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!62630

Add cadence edit page

See merge request gitlab-org/gitlab!62587

Avoid duplicate pipeline due to container scanning job

See merge request gitlab-org/gitlab!62810

Merge branch 'Fix-Vale-issues-for-(/administration/maintenance_mode/index.md)-#332115' into 'master'

documentation: Fix Vale issues for /administration/maintenance_mode/index.md

See merge request gitlab-org/gitlab!62988

Enable time tracking quick actions only for issues and incidents

See merge request gitlab-org/gitlab!62318

docs: Format code blocks

See merge request gitlab-org/gitlab!62972

Fix invite group button showing when signed out

See merge request gitlab-org/gitlab!62320

Fix the `requiring_cleanup` scope in ContainerRepository model

See merge request gitlab-org/gitlab!62827

Update quarantine branch to main

See merge request gitlab-org/gitlab!62910

Rename instance_statistics_measurements_table

See merge request gitlab-org/gitlab!62797

Update vsa navigation specs for the horizontal flow

See merge request gitlab-org/gitlab!56437

Use `#use_open_file` for NuGet metadata extraction [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!62471

instead of `#use_file` which will use an exclusive lock

Changelog: fixed

Add user/project/namespace in snowplow tracking

See merge request gitlab-org/gitlab!62661

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Fix non-custom Total stage in VSA

See merge request gitlab-org/gitlab!62889

General style cleanup for LDAP page

See merge request gitlab-org/gitlab!62768

Prevent projects with same slug from having same service desk project key

See merge request gitlab-org/gitlab!62240

Update group sync with tips and screenshot

See merge request gitlab-org/gitlab!60821

Docs - Artifacts - delete invalid references

See merge request gitlab-org/gitlab!62592

Remove two flaky tests from smoke suite

See merge request gitlab-org/gitlab!62639

Remove ambiguity with repository paths

See merge request gitlab-org/gitlab!62957

Add docs for Audit Events in Free tier

See merge request gitlab-org/gitlab!62618

Fixing empty HTML id values on MR page

See merge request gitlab-org/gitlab!62806

Bump Rails to 6.1 [RUN ALL RSPEC] [RUN AS-IF-FOSS]

See merge request gitlab-org/gitlab!59107