Drop support for providing resource as dict in KubernetesPodOperator

[eladkal]

Dropping support for resource parameter
Deprecation added in #24673

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[dstandish]

left comment but approving anyway

[potiuk]

Cool. Test needs fixing though.

[dstandish]

Ran the test locally on this branch (using virtualenv + docker desktop)

Saw this is the error diff:

[dstandish]

should we also remove this module?

[eladkal]

I didn't find any more usage in the code to convert_resources so I removed it.
I think we should remove the whole backward compact module but it needs more close look on the other functions

[dstandish]

ok so to fix.... first of all, actual vs expected needs to be flipped in those asserts

then this needs to be removed from the "expeced"

                        "resources": {},

(really just remove that line should do it, can leave the assert flipping for another time since it's tough for you to test locally)

[eladkal]

CI is green :)
@dstandish can you review?