Create `.helm` before referencing it.
Create `.helm` before referencing it.

When experimenting with bazel remote execution of this repo, I am getting an error

```
tar: .helm: Cannot stat: No such file or directory
```

This might be specific to my setup, but creating the directory in advance seems harmless and it does fix my build error.

The second change is caused by running `bazel run :gazelle`. The pre-commit hook would not let me commit without doing this.

Change-Id: Icdbbdefd54212efaddb8bf3e432d4e5ed916617f
GitOrigin-RevId: 10509e3ee5d8624d250646c08c86232adc3f25fe

googlecloudrobotics/core,googlecloudrobotics/core,googlecloudrobotics/core