Controller JSON logging and sending Agent TPS and Session Start metrics to Cloudwatch

Controller Logging:

• Enabled JSON logging to track controller workflow in spinning up agents with thread context initialized on job start
• instanceId assigned to controller EC2 instance to track controller logs for each job
• Added stopBehavior , termination policy, and useEips fields to controller logs, with stopBehavior and useEips propagated to agent logs
• Tank V2 API Logging Interceptor implemented to add/clear thread context for V2 API logging (namely agentReady)

Agent Logging:

• Fixed logs missing JSON fields across some calls (i.e RunConcurrentTestPlans())
• stopBehavior and useEips fields added to logs

All JSON logs are now consistently using ObjectMessage mapping for the message field.

Cloudwatch Metrics:

• Now sending Agent TPS and Session Start metrics to CloudWatch

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