🌱 KCP should avoid to reconcile certificates too early

[fabriziopandini]

What this PR does / why we need it:
This PR prevents KCP to reconcile certificate expiration if the control plane is not yet initialized, thus getting rid of some noisy errors in the logs.

[killianmuldoon]

/lgtm

[killianmuldoon]

Should this be cherry-picked to 1.3 as a bugfix?

[ykakarap]

/lgtm

[fabriziopandini]

self approve given two lgtm + this will allows us to start making final tests for the patch release
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fabriziopandini

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [fabriziopandini]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[fabriziopandini]

/cherry-pick release-1.3

[k8s-infra-cherrypick-robot]

@fabriziopandini: new pull request created: #7744

In response to this:

/cherry-pick release-1.3

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[fabriziopandini]

/cherry-pick release-1.2

[k8s-infra-cherrypick-robot]

@fabriziopandini: #7727 failed to apply on top of branch "release-1.2":

Applying: KCP should avoid to reconcile certificates too early
Using index info to reconstruct a base tree...
M	controlplane/kubeadm/internal/controllers/controller.go
M	controlplane/kubeadm/internal/controllers/controller_test.go
Falling back to patching base and 3-way merge...
Auto-merging controlplane/kubeadm/internal/controllers/controller_test.go
CONFLICT (content): Merge conflict in controlplane/kubeadm/internal/controllers/controller_test.go
Auto-merging controlplane/kubeadm/internal/controllers/controller.go
CONFLICT (content): Merge conflict in controlplane/kubeadm/internal/controllers/controller.go
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
Patch failed at 0001 KCP should avoid to reconcile certificates too early
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".

In response to this:

/cherry-pick release-1.2

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[fabriziopandini]

Note: this should not be backported to 1.2 because certificate remediation was introduced in 1.3 only