Adds the detailed alert skeleton for alert management

What does this MR do?

Adds basic skeleton and tabs for the detailed view of alerts in alert management.

Changelog not required as the feature is behind the alert-management-minimal flag and not released.

issue: #213911 (closed) & #216203 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines