- 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/actions/run-tests/action.yml

@@ -15,7 +15,7 @@ runs:
   steps:
     - name: run rtl build script cache of chipyard root should have been loaded by prepare-rtl
       run: |
-        export RISCV="/__w/chipyard/chipyard/riscv-tools-install"
+        export RISCV="$GITHUB_WORKSPACE/riscv-tools-install"
         export LD_LIBRARY_PATH="$RISCV/lib"
         export PATH="$RISCV/bin:$PATH"
         ./.github/scripts/${{ inputs.run-script }} ${{ inputs.project-key }}