fix: don't attempt to run non-existent tests

Author: skrobul

.github/workflows/code-test.yaml

@@ -30,7 +30,7 @@ jobs:
         id: set-projects
         run: |
           # grabs all paths with pyproject.toml, snips the 2nd dir, grabs only unique ones, makes a JSON list
-          projects=$(find python -mindepth 2 -name pyproject.toml | awk -F/ '{print $2}' | sort -u | jq -R -s -c 'split("\n")[:-1]')
+          projects=$(find python -mindepth 2 ! -wholename 'python/understack-tests/*' -name pyproject.toml | awk -F/ '{print $2}' | sort -u | jq -R -s -c 'split("\n")[:-1]')
           echo "projects=$projects" >> "$GITHUB_OUTPUT"
   python:
     needs: [discover]