Refactor vtorc tests to run as a single test with sub-tests

[GuptaManan100]

Description

This PR refactors some VTOrc tests to run as a single test with sub-tests. The time of execution is brought down from 6 minutes 34 seconds to 5 minutes 5 seconds.

Related Issue(s)

Checklist

• "Backport me!" label has been added if this change should be backported
• Tests were added or are not required
• Documentation was added or is not required

Deployment Notes

[vitess-bot]

Review Checklist

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Backward compatibility

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[rsajwani]

LGTM