Auto Rollback When a critical alert is raised

What does this MR do?

This MR integrates the Auto Rollback service into Alert Management. This allows Auto Rollback to be triggered when a new critical alert is raised.

Related #35404 (closed)

Feature Flag

This feature is under development and disabled by default with cd_auto_rollback feature flag.

Manual QA

Confirmed that this feature is working as intended on local development instance:

Confirmed that the documentation link is correct:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

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 @gitlab-com/gl-security/appsec
• 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