[sqlserver] add sqlserver agent completed job metrics to metadata

[lu-zhengda]

What does this PR do?

This PR adds sqlserver.agent.completed_jobs.duration and sqlserver.agent.completed_jobs.executions (DBM only) to metadata.csv.

Motivation

Additional Notes

Review checklist (to be filled by reviewers)

• [ ] Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• [ ] Changelog entries must be created for modifications to shipped code
• [ ] Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• [ ] If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.85%. Comparing base (c14b128) to head (2a3f175). Report is 3 commits behind head on master.

Additional details and impacted files

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