test (machine) : add some unit tests for growing lvm size based on persistent-volume-size config option in microshift preset

[rohanKanojia]

Description

Add some unit tests for method growLVForMicroshift

Relates to: #4186, PR #4623

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Proposed changes

• Replace *crcssh.Runner growLVForMicroshift method argument to receive an interface instead
• Add unit tests using mocked implementation of ssh runner to verify various combinations of persistent-volume-size and size growth performed by the method

Testing

I've only verified that build is passing.

Contribution Checklist

• I Keep It Small and Simple: The smaller the PR is, the easier it is to review and have it merged
• I have performed a self-review of my code
• 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
• Which platform have you tested the code changes on?
  • Linux
  • Windows
  • MacOS

[openshift-ci]

Skipping CI for Draft Pull Request.
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[openshift-ci]

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[openshift-ci]

@rohanKanojia: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-crc	b762672	link	true	/test e2e-crc

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