Enable Spotless verification for Android Port and consolidate reporting

- Added `spotless-maven-plugin` to `maven/android/pom.xml` configured for `Ports/Android/src`.
- Updated `scripts/build-android-port.sh` to run `spotless:check` and capture results to a report file.
- Modified `scripts/lib/cn1ss.sh` and `scripts/run-android-instrumentation-tests.sh` to append the Spotless report to the main Android status comment.
- Updated `scripts/run-android-instrumentation-tests.sh` to fail the build if Spotless checks failed, after reporting is complete.
- Updated `.github/workflows/scripts-android.yml` and reporting scripts to suppress noisy "missing report" warnings and correctly collect test artifacts.

Author: google-labs-jules[bot]

scripts/build-android-port.sh

@@ -134,7 +134,7 @@ fi
 run_maven -q -f maven/pom.xml -pl android -am -Dcn1.binaries="$CN1_BINARIES" -P !download-cn1-binaries -T 1C -Dmaven.javadoc.skip=true -Dmaven.source.skip=true -Djava.awt.headless=true clean install "$@"
 
 log "Running Spotless verification..."
-ARTIFACTS_DIR="${ARTIFACTS_DIR:-../artifacts}"
+ARTIFACTS_DIR="${ARTIFACTS_DIR:-artifacts}"
 mkdir -p "$ARTIFACTS_DIR" || true
 SPOTLESS_REPORT="$ARTIFACTS_DIR/spotless-report.md"
 SPOTLESS_LOG="$ARTIFACTS_DIR/spotless.log"