Automatic merge from submit-queue (batch tested with PRs 58697, 58658, 58676, 58674). 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 salt configuration from the fluentd-gcp configuration.

Remove a bit of left-over salt. This was missed in https://github.com/kubernetes/kubernetes/pull/58248

xref: #49213

**Release note**:

```release-note
NONE
```