Automatic merge from submit-queue (batch tested with PRs 50626, 50683, 50679, 50684, 50460)

kubeadm: Centralize client create-or-update logic in one package

**What this PR does / why we need it**:

Moves all Create-or-Update logic into one package instead of duplicating that logic all around in the codebase.

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

**Special notes for your reviewer**:

This PR depends on https://github.com/kubernetes/kubernetes/pull/50214.
Note that commit 2 is the only one that needs reviewing.
This PR is required for https://github.com/kubernetes/kubernetes/pull/48899 (kubeadm upgrade)

**Release note**:

```release-note
NONE
```
@kubernetes/sig-cluster-lifecycle-pr-reviews @mattmoyer @fabriziopandini