[O11y][Kafka] Update layout of dashboards

[rajvi-patel-22]

Description

In the logs overview dashboard include the below changes:

1. Have the legend for the Logs over time added to the bottom of the visualisation instead of right side
2. Reduce the space allocated for log.level and more space added for the message

In the Metrics overview dashboard have the below changes:

1. Single stat representing the brokers must be the first one in the first row
2. Have consumer partition reassignments and Kafka broker table in the second row
3. Have kafka topic chart and table in the thrid row
4. Have consumer group chart and table in the fourth row

Related PR

• [O11y][Kafka] Migration for visualizations to lens in kibana 8.8.0 #5594

Screenshot

Logs Dashboard

Metrics Dashboard