feat(test): adds clearUnusedMocks flag to remove the unused mocks of a test-set

[re-Tick]

Related Issue

• When the test-case is deleted from the test-set, the mocks for that test-case still exists in the mocks.yaml file of that test-set. The mocks should be cleared on running test cmd.

Closes: #1712

Describe the changes you've made

The changes do 2 things:

• Logs the used mocks by the failed test-case in its result log
• Adds a --clearUnusedMocks flag for test cmd to remove the unused mocks from the mocks.yaml of the test-set.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Please let us know if any test cases are added

Tested the changes with go sample application for gin-mongo, mux-sql.

Describe if there is any unusual behaviour of your code(Write NA if there isn't)

A clear and concise description of it.

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[charankamarapu]

Please address the comments

[re-Tick]

Please review now, addressed your comments.

[charankamarapu]

Ship it!