Enable `mail_room`'s structured logging in GitLab
What does this MR do?
This MR enables the changes in our codebase by upgrading the gem and adding the requisite config change.
Related to #35108 (closed)
Does this MR meet the acceptance criteria?
- [-] Changelog entry
- Documentation created/updated or follow-up review issue created
- Code review guidelines
- Merge request performance guidelines
- Style guides
- [-] Database guides
- [-] Separation of EE specific content
Availability and Testing
Any gem upgrade can introduce behaviour changes that might have unintended regressions. This will need to be tested to ensure it actually works too :)
- [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
- [-] Tested in all supported browsers
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
- [-] Label as security and @ mention
- [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
- [-] Security reports checked/validated by a reviewer from the AppSec team
Closes #35108 (closed)