[Feature] Management cluster registration mock tests

[ghost]

1. What this PR does / why we need it: Management cluster registration mock tests

2. Which issue(s) this PR fixes

3. Additional information Related task: TMC-34852

4. Special notes for your reviewer

[codecov-commenter]

Codecov Report

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

Comparison is base (efa7cb8) 25.50% compared to head (83ed771) 25.50%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## feature/management_cluster_registration #337 +/- ## ======================================================================== Coverage 25.50% 25.50% ======================================================================== Files 162 162 Lines 14536 14536 ======================================================================== Hits 3707 3707 Misses 10660 10660 Partials 169 169 ```

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[shobha2626]

Please attach a screenshot of successful mock test run

[ghost]

Please attach a screenshot of successful mock test run

Original:

Commented out kubeconfig acceptance test case to have explicit green result:

[shobha2626]

Please attach a screenshot of successful mock test run

Original:

Commented out kubeconfig acceptance test case to have explicit green result:

Passing a dummy kubeconfig should pass as we are mocking the API’s?

[ghost]

Please attach a screenshot of successful mock test run

Original: Commented out kubeconfig acceptance test case to have explicit green result:

Passing a dummy kubeconfig should pass as we are mocking the API’s?

No, I didn't see point mocking k8s client. This would mean creating mock responses to lot of layers. I checked that other resources haven't mock k8s client either.