Rename flaky_report to integration_test_report and add try/finally cleanup

- Rename scripts/flaky_report/ to scripts/integration_test_report/ to
  reflect expanded scope beyond flaky-test detection
- Update workflow references in both CI files
- Wrap file search integration tests in try/finally to ensure vector
  store cleanup runs even on test failure or timeout

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

python/scripts/integration_test_report/__init__.py

@@ -7,5 +7,5 @@ them with historical data, and generates a markdown trend report showing
 per-test status across the last N runs.
 
 Usage:
-    uv run python -m scripts.flaky_report <reports-dir> <history-file> <output-file>
+    uv run python -m scripts.integration_test_report <reports-dir> <history-file> <output-file>
 """

python/scripts/integration_test_report/__main__.py

@@ -3,10 +3,10 @@
 """CLI entry point for the integration test report tool.
 
 Usage:
-    uv run python -m scripts.flaky_report <reports-dir> <history-file> <output-file>
+    uv run python -m scripts.integration_test_report <reports-dir> <history-file> <output-file>
 
 Example (from python/ directory):
-    uv run python -m scripts.flaky_report \\
+    uv run python -m scripts.integration_test_report \\
         ../test-results/ \\
         integration-report-history.json \\
         integration-test-report.md
@@ -14,7 +14,7 @@ Example (from python/ directory):
 
 import sys
 
-from scripts.flaky_report.aggregate import main
+from scripts.integration_test_report.aggregate import main
 
 if __name__ == "__main__":
     sys.exit(main())