Don't run the GHA exhaustion test generally

.github/workflows/check-and-test.yaml

@@ -79,6 +79,8 @@ jobs:
         run: |
           nix develop --command echo "just testing"
       - name: Exhaust our GitHub Actions Cache tokens
+        # Generally skip this step since it is so intensive
+        if: ${{ false }}
         run: |
           date >> README.md
           nix build .#veryLongChain -v