helm: add required validation for EPP CPU and memory requests

[mayuka-c]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
This is used to make sure that CPU and mem requests are set.

Which issue(s) this PR fixes:

Fixes #2499

Does this PR introduce a user-facing change?:

Make EPP CPU and Mem requests as required.

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[mayuka-c]

/cc @kfswain PTAL

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