- remove unused GA build-extra-tests/action.yml

- cleanup exports in CA
  - remove exports from build-extra-tests CA
  - put exports in build-extra-tests.sh
    - based it on $GITHUB_WORKSPACE
  - changed exports in run-tests CA to use $GITHUB_WORKSPACE
- in common.mk
  - removed TODO comment lines where `$(sim)` had been removed
  - removed commented out lines that used `$(sim)`
- removed unused debugging script1.sh

.github/workflows/chipyard-run-tests.yml

@@ -140,11 +140,7 @@ jobs:
           key: ${{ needs.make-keys.outputs.extra-tests-cache-key }}
           restore-keys: ${{ needs.make-keys.outputs.extra-tests-cache-key }}
       - name: Build extra tests if not cached
-        run:  |
-          export RISCV="/__w/chipyard/chipyard/riscv-tools-install"
-          export LD_LIBRARY_PATH="$RISCV/lib"
-          export PATH="$RISCV/bin:$PATH"
-          .github/scripts/build-extra-tests.sh
+        run: .github/scripts/build-extra-tests.sh
 
   install-verilator:
     name: install-verilator