fake-client in UTs

[Garvit-77]

What this PR does / why we need it: This PR implements Changes of UTs with fake client instead of gomock Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged): Fixes #2408

Checklist:

• [Y] Docs included if any changes are user facing

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[Garvit-77]

Hey @tenzen-y Please let me know any changes and I think KatibClientMock does have the function for handling fake client should i create that with this pr ?

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