[O11y][RabbitMQ] Lens migration

[harnish-elastic]

Manually migrate RabbitMQ visualizations to lens in kibana version 8.0.0.

Preparation of data for testing

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

Migration stats

RabbitMQ Dashboards	Before Migration		After Migration
	Lens	Visualization	Lens	Visualization
[Metrics RabbitMQ] Overview	0	4	4	0
	0	4	4	0

Data stream : Node

• Migrate 4 visualizations to the lens
  • [O11y][RabbitMQ] Lens migration for visualizations to kibana version 8.0.0 #5536

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 Dashboard are not distorted in supported kibana version (8.0.0)

[harnish-elastic]

PR is approved and merged. Hence closing this issue!