[O11y][Prometheus] Prometheus Lens migration

[rajvi-patel-22]

Manually migrate Prometheus visualizations to the lens in the Kibana version 8.9.0 itself.

Preparation of data for testing

• Use sample_event.json / setup live instance using docker / mock data using a mock server to populate dashboards

Migration stats

	Before Migration		After Migration
	Lens	Vizualization	Lens	Vizualization
[Metrics Prometheus] Prometheus Server overview	0	12	12	0

Dashboard : [Metrics Prometheus] Prometheus Server overview

• Migrate visualization to the lens.
  • [O11y][Prometheus] Migrate Prometheus Server Overview dashboard to lens #8016

Verification and Validation

• Verification of functionality remains the same after migration in Kibana
• Verification of data count of after-migrated visualization with before-migrated visualization in Kibana
• Verification of Dashboards is not distorted in the supported Kibana version ^8.9.0