fix: exclude release scratch dirs from RAT and sync bash rat excludes

The apache-rat-plugin runs during the verify phase on every install,
including the six `mvnw ... install` runs in build-release-comet.sh.
RAT walks the root module tree and the exclude list did not cover
several untracked generated/scratch directories that accumulate during
a release (Python virtualenv, docker workdir, extracted tarballs, rat
report files, and the downloaded rat jar). Populated, these make each
RAT pass slow and the build appears to hang.

Add excludes for those paths to the Maven apache-rat-plugin config.

Also reconcile the bash rat exclude list with the Maven excludes: the
bash check flagged seven files that Maven already skips (the .claude
skill docs, .github/workflows/README.md, and the jni-bridge testdata
backtrace/stacktrace fixtures that moved from native/testdata).

Author: andygrove

dev/release/rat_exclude_files.txt

@@ -1,12 +1,16 @@
 *.gitignore
 *.dockerignore
 .github/pull_request_template.md
+.github/workflows/README.md
 .gitmodules
+.claude/skills/*/SKILL.md
 native/Cargo.lock
 native/testdata/backtrace.txt
 native/testdata/stacktrace.txt
 native/core/testdata/backtrace.txt
 native/core/testdata/stacktrace.txt
+native/jni-bridge/testdata/backtrace.txt
+native/jni-bridge/testdata/stacktrace.txt
 dev/copyright/scala-header.txt
 dev/diffs/iceberg/*.diff
 dev/release/requirements.txt

pom.xml

@@ -1167,6 +1167,12 @@ under the License.
             <exclude>docs/source/contributor-guide/*.svg</exclude>
             <exclude>dev/release/rat_exclude_files.txt</exclude>
             <exclude>dev/release/requirements.txt</exclude>
+            <exclude>dev/release/venv/**</exclude>
+            <exclude>dev/release/comet-rm/workdir/**</exclude>
+            <exclude>dev/dist/**</exclude>
+            <exclude>dev/release/rat.txt</exclude>
+            <exclude>dev/release/filtered_rat.txt</exclude>
+            <exclude>dev/release/*.jar</exclude>
             <exclude>native/proto/src/generated/**</exclude>
             <exclude>benchmarks/tpc/queries/**</exclude>
             <exclude>.claude/**</exclude>