[O11y][MongoDB] Lens Migration

[rajvi-patel-22]

Manually migrate MongoDB visualizations to lens in current Kibana version 8.1.0 itself.

Preparation of data for testing

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

Migration stats

MongoDB Dashboards	Before Migration		After Migration
	Lens	Visualization	Lens	Visualization
[Metrics MongoDB] Overview	0	8	8	0
[Logs MongoDB] Overview	0	1	1	0
	0	9	9	0

Data stream : Log

• Migrate 1 visualization to the lens.
  • [O11y][MongoDB] Migrate Logs Overview dashboard visualizations to lens in kibana 8.1.0  #5831

Data stream : Status

• Migrate 8 visualization to the lens.
  • [O11y][MongoDB] Migrate Metrics Overview dashboard visualizations to lens in kibana 8.1.0 #5830

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 (8.1.0)

[rajvi-patel-22]

PR is approved and merged, hence closing this issue:
#5830
#5831