Add granular task level maintenance job metrics

[kamanavishnu]

Problem & Summary

In the current state, we do not have entity level metrics for maintenance jobs. All the metrics are at an aggregate level and it does not help with action items directly. For example, if the number of failed maintenance jobs is 10, there is no description of which entities the failed jobs correspond to. Someone needs to parse the logs to identify what are the tables impacted by these failures.

This change adds granular task level maintenance job metrics to solve for such cases.

Added metrics:

• maintenance_job_triggered
  • Counter -- tracks number of maintenance jobs triggered per entity
• maintenance_job_skipped
  • Counter -- tracks number of maintenance jobs skipped per entity
• maintenance_job_completed
  • Counter -- tracks number of maintenance jobs completed per entity along with the status of the maintenance job

Changes

• Client-facing API Changes
• Internal API Changes
• Bug Fixes
• New Features
• Performance Improvements
• Code Style
• Refactoring
• Documentation
• Observability
  • Add new metrics to track maintenance job updates at an entity level
• Tests

Testing Done

Adding new metrics, no additional tests added

[dushyantk1509]

@kamanavishnu This PR seems to be missing maintenance_job_triggered metrics for parallel execution paths - buildOperationTaskListInParallel. Is this intentional?

[kamanavishnu]

@kamanavishnu This PR seems to be missing maintenance_job_triggered metrics for parallel execution paths - buildOperationTaskListInParallel. Is this intentional?

Good catch, updated it here