Save Prometheus Alert and Environment on Alert

What does this MR do?

This builds upon !34995 (merged), and saves the environment and prometheus_alert into the AlertManagement::Alert, for prometheus alerts.

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

Part of #222253 (closed)