🐛 Revert "Supporting externally managed Control Plane"

[nrb]

This reverts commit 6193d17, reversing changes made to 6ffb575.

What type of PR is this?

/kind regression

What this PR does / why we need it:

These changes are causing a panic when the controlPlaneRef is nil.

Reverts #4438 (cc @prometherion)

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 #4818

Special notes for your reviewer:

Checklist:

• squashed commits
• includes emojis

Release note:

NONE

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[vincepri]

/lgtm
/assign @richardcase

[nrb]

/retitle 🐛 Revert "Supporting externally managed Control Plane"

[prometherion]

@nrb there's a proposed fix with #4817, reverting this commit would ruin my efforts in supporting this feature.

Asking to get this in hold @vincepri

[nrb]

@prometherion I think that's fair.

/hold

[nrb]

I'm going to close this in favor of #4817 or #4822, since according to slack conversations, other projects rely on this PR. Plus, it's been in flight for quite a while and we should fix forward.

Thank you for your contributions @prometherion and apologies for confusion.