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MINOR: [Release] Proactively remove java-jni-dist directory in verification script (#44718)

### Rationale for this change

If you set `ARROW_TMPDIR` and run `TEST_DEFAULT=0 TEST_INTEGRATION=1 dev/release/verify-release-candidate.sh` repeatedly, you'll run into an error:

> mv: rename /Users/bryce/src/apache/arrow/arrow-tempdir//java-jni-install/lib/arrow_cdata_jni to /Users/bryce/src/apache/arrow/arrow-tempdir//java-jni-dist/arrow_cdata_jni: Directory not empty

### What changes are included in this PR?

In the `test_package_java` step in the verification script, I added a `rm -fr `to get rid of java-jni-dist dir so the following `mv` command works.

### Are these changes tested?

Yes, locally.

### Are there any user-facing changes?

No.

Authored-by: Bryce Mecum <petridish@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>