🌱 Release Notes Generator - Test cases for main.go and ref.go

[irapandey]

What this PR does / why we need it:
This PR adds unit tests for release note generator to add more coverage to non-covered functions

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 #
This PR partially fixes #11368
Will raise small PRs to make review easier

/area testing

[k8s-ci-robot]

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[k8s-ci-robot]

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[k8s-ci-robot]

Hi @irapandey. Thanks for your PR.

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[irapandey]

@chandankumar4 - Can you take a look here please

[sbueringer]

/ok-to-test