fix: Correctly deploy instance types from URL

[akrejcir]

What this PR does / why we need it: This PR fixes 2 issues:

• When setting, unsetting, and setting again the .spec.commonInstancetypes.URL field, resources would not be deployed when URL is set for the second time. This was because the URL was cached the first time and not cleared.
• When instance types were deployed from URL, the operator would not revert any changes to them.

Release note:

None