[SPARK-55433][INFRA] Remove labeler in GitHub Actions

### What changes were proposed in this pull request?

There might be a security issue.

### Why are the changes needed?

Remove labeler.yml

### Does this PR introduce _any_ user-facing change?

No, dev-only.

### How was this patch tested?

Will monitor the CI.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #54216 from HyukjinKwon/SPARK-55433.

Authored-by: Hyukjin Kwon <gurwls223@apache.org>
Signed-off-by: Hyukjin Kwon <gurwls223@apache.org>