Automatic merge from submit-queue (batch tested with PRs 66152, 66406, 66218, 66278, 65660). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Handle errors
**What this PR does / why we need it**:
This is a followup PR for https://github.com/kubernetes/kubernetes/pull/64664 to handle errors returned from `.AddToScheme()` in places where they are not handled.
**Release note**:
```release-note
NONE
```
/kind cleanup
/sig api-machinery
/cc @sttts
Kubernetes-commit: 6c500be0808cfe9aff1141ec83ad885d04dd25ae
Automatic merge from submit-queue (batch tested with PRs 61803, 64305, 64170, 64361, 64339). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Add TLS support to exec authenticator plugin
**What this PR does / why we need it**:
https://github.com/kubernetes/community/blob/master/contributors/design-proposals/auth/kubectl-exec-plugins.md#tls-client-certificate-support
Allows exec plugin to return raw TLS key/cert data. This data populates
transport.Config.TLS field.
This requires a change to AuthProvider interface to expose TLS configs,
not only RoundTripper.
**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#61421
**Special notes for your reviewer**:
**Release note**:
```release-note
Exec authenticator plugin supports TLS client certificates.
```
Kubernetes-commit: f701b7529937493a64f2f2553aa9a5cd7020d9b7
Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.
Remove YEAR field of all generated files and fix kubernetes boilerplate checker
**What this PR does / why we need it**:
Remove YEAR field of all generated files and fix kubernetes boilerplate checker
xref: [remove YEAR fileds in gengo #91](https://github.com/kubernetes/gengo/pull/91)
**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 [#gengo/issues/24](https://github.com/kubernetes/gengo/issues/24)
**Special notes for your reviewer**:
/cc @thockin @lavalamp @sttts
**Release note**:
```release-note
NONE
```
Kubernetes-commit: e40ffd71972b820aeed283946e880aa2479f8524
