Python: Fix CLI integration tests

Two issues:

- Tests relying on existing query machinery (i.e. `import python`) were not resolving
  correctly due to a bad `qlpack.yml` file.
- The diagnostics output tests needed an updated import to account for their new location.

python/extractor/cli-integration-test/writing-diagnostics/test_diagnostics_output.py

@@ -1,6 +1,6 @@
 import os
 import sys
-sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "..", "integration-tests"))
+sys.path.append(os.path.join(os.path.dirname(__file__), "..", "..", "..", "..", "..", "integration-tests"))
 import diagnostics_test_utils
 
 test_db = "db"