🌱 apidiff: deduplicate apidiff logic

[sbueringer]

Signed-off-by: Stefan Büringer [email protected]

What this PR does / why we need it:
This PR deduplicates the apidiff "logic". We should use our makefile targets in CI when easily possible.

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 #

[sbueringer]

cc @sonasingh46 @geetikabatra

[killianmuldoon]

/lgtm

[geetikabatra]

Thanks @sbueringer
/lgtm

[k8s-ci-robot]

@geetikabatra: changing LGTM is restricted to collaborators

In response to this:

Thanks @sbueringer
/lgtm

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[sbueringer]

/retest
(hopefully) unrelated flake

[sbueringer]

Had to use ?= instead of := to make it overwritable

[killianmuldoon]

Had to use ?= instead of := to make it overwritable

TIL 😄

[killianmuldoon]

/lgtm

[fabriziopandini]

/approve

[k8s-ci-robot]

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