<commit_before>```release-note:bug
auth/kubernetes: Fix error code when using the wrong service account
```<commit_msg>Add change release note for Kubernetes auth (#15891)<commit_after>```release-note:bug
auth/kubernetes: Fix error code when using the wrong service account
```
```release-note:change
auth/kubernetes: If `kubernetes_ca_cert` is unset, and there is no pod-local CA available, an error will be surfaced when writing config instead of waiting for login.
```
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