custom cloud provider secret is overwritten with default values

[devigned]

/kind bug

[Before submitting an issue, have you checked the Troubleshooting Guide?]

What steps did you take and what happened:
Contents of the control plane custom cloud provider secret are overwritten with default values.

What did you expect to happen:
The secret should not be overwritten if it already exists and is not marked as owned by the cluster.

Anything else you would like to add:
@nilo19 ran into this and reported it to me. I have not verified the behavior.

/help
/good-first-issue

[CecileRobertMichon]

/remove-good-first-issue

we should validate this issue exists before we mark it as suitable for new contributors