Add runbooks to metric dashboard alerts - frontend

What does this MR do?

• Integrates the Alert Runbook field with the backend.

Depends on sy-alert-runbook-ui-be (!38234 (merged))

To test:

1. Enable the feature flag alert_runbooks.
2. Set up a metrics dashboard.
3. Select the ellipsis on a populated chart, and choose 'Alerts'

issue: #208490 (closed)

Screenshots

before	after

Does this MR meet the acceptance criteria?

Conformity

• [n/a] Changelog entry To be added in #232462 (closed).
• Documentation (if required) MR here: !38661 (merged)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [n/a] Database guides
• [n/a] Separation of EE specific content Discussion about license is ongoing here: &1436 (comment 390588907)

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
• [n/a] 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:

• [n/a] Label as security and @ mention @gitlab-com/gl-security/appsec
• [n/a] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [n/a] Security reports checked/validated by a reviewer from the AppSec team