Merge pull request #61803 from awly/client-auth-exec-tls

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

vendor/k8s.io/apimachinery/pkg/apis/meta/v1/conversion.go

@@ -75,6 +75,8 @@ func AddConversionFuncs(scheme *runtime.Scheme) error {
 		Convert_unversioned_LabelSelector_to_map,
 
 		Convert_Slice_string_To_Slice_int32,
+
+		Convert_Slice_string_To_v1_DeletionPropagation,
 	)
 }
 
@@ -304,3 +306,13 @@ func Convert_Slice_string_To_Slice_int32(in *[]string, out *[]int32, s conversio
 	}
 	return nil
 }
+
+// Convert_Slice_string_To_v1_DeletionPropagation allows converting a URL query parameter propagationPolicy
+func Convert_Slice_string_To_v1_DeletionPropagation(input *[]string, out *DeletionPropagation, s conversion.Scope) error {
+	if len(*input) > 0 {
+		*out = DeletionPropagation((*input)[0])
+	} else {
+		*out = ""
+	}
+	return nil
+}