[O11y][Nginx Ingress controller] Nginx Ingress controller Lens migration

[rajvi-patel-22]

Manually migrate Nginx Ingress controller visualizations to the lens in the Kibana version ^8.6.0 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	Old Input controls	Lens	Vizualization	New Controls
[Logs Nginx Ingress Controller] Access and error logs	0	1	1
[Logs Nginx Ingress Controller] Overview	0	8	1

Dashboard : [Logs Nginx Ingress Controller] Access and error logs

• Migrate visualization to the lens.
  • [O11y][Logs Nginx Ingress Controller] Migrate Nginx Ingress Controller Access and Error Dashboard to lens #8143

Dashboard : [Logs Nginx Ingress Controller] Overview

• Migrate visualization to the lens.
  • [O11y][Logs Nginx Ingress Controller] Migrate Nginx Ingress Controller Overview Dashboard to lens #8142

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 ^8.6.0