CHORE: Cleanup coveragerc

[bewithgaurav]

Work Item / Issue Reference

AB#<WORK_ITEM_ID>

GitHub Issue: #<ISSUE_NUMBER>

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Summary

[Copilot]

Pull Request Overview

This PR cleans up the .coveragerc configuration file by updating the list of files to omit from code coverage analysis. The changes remove one previously omitted file and add three new files to the omit list.

• Removes mssql_python/testing_ddbc_bindings.py from coverage omission
• Adds main.py, setup.py, and bcp_options.py to the coverage omission list

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