Automatic created Ngnix alert after Prometheus install (2/2)

What does this MR do?

This adds the second lot of Nginx alerts to the the default Prometheus alert setup.

The first batch (Nginx Ingress) were added in !28503 (merged). This MR adds the non-ingress (kubernetes) Nginx metrics.

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

Closes #118788 (closed)