chore: Add unit tests for pkg/apply

[akagami-harsh]

What this PR does / why we need it:

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):

• Fixes Add unit tests that cover the pkg/apply package #2452

Checklist:

• Docs included if any changes are user facing

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[tenzen-y]

Thanks, this is very initial comments.
Could you re-implement based on coding guide?
http://github.com/kubeflow/katib/blob/master/CONTRIBUTING.md#go-development

Other Trainer v2 UTs are helpful to understand what we should do

[arnabnandikgp]

hey @akagami-harsh do you have the bandwidth to complete the work on this, or perhaps I can take this up in a new PR. Please let me know :)