Define minimum limits to run the ingress controller

[aledbf]

What this PR does / why we need it:

Which issue this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close that issue when PR gets merged): fixes #4735

Special notes for your reviewer:

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[aledbf]

/retest

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[aledbf]

/retest

[edmorley]

Hi! The LimitRange added here is causing errors with the default cert-manager Issuer configurations - see #5210. Many thanks :-)