Add missing tests for the pkg/record

[ditsuke]

What this PR does / why we need it:
Adds missing tests for recorder.Eventf() and recorder.Warnf(). These functions are similar to recorder.Event() and
recorder.Warn() (already tested) and are used to log events to the event recorder but with message formatting with fmt.Sprintf
under the hood.

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 #1419

Signed-off-by: ditsuke ditsuke@protonmail.com

[k8s-ci-robot]

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[srm09]

/ok-to-test
/lgtm

[srm09]

/approve

[k8s-ci-robot]

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