fix(gradle-build-pr): deduplicate junit_files glob to avoid double-counted results (#7)

The previous junit_files config listed two overlapping globs:
  - artifacts/**/TEST-*.xml
  - artifacts/**/test-results/**/*.xml

Both match the same Gradle JUnit reports (TEST-*.xml under test-results),
so EnricoMi/publish-unit-test-result-action would parse each file twice
and inflate the totals reported on PR comments and the check summary.

Consolidate to the single canonical pattern
artifacts/**/test-results/**/TEST-*.xml.

Author: TheMeinerLP

.github/workflows/gradle-build-pr.yml

@@ -172,9 +172,7 @@ jobs:
         uses: EnricoMi/publish-unit-test-result-action@v2
         if: always()
         with:
-          junit_files: |
-            artifacts/**/TEST-*.xml
-            artifacts/**/test-results/**/*.xml
+          junit_files: artifacts/**/test-results/**/TEST-*.xml
           check_name: "Test results"
           comment_mode: changes in failures
           report_individual_runs: true