Enable partial transpilation for upgradeable package (#4628)

Co-authored-by: Hadrien Croubois <hadrien.croubois@gmail.com>
(cherry picked from commit 58463a9823)

.github/actions/setup/action.yml

@@ -15,5 +15,3 @@ runs:
       run: npm ci
       shell: bash
       if: steps.cache.outputs.cache-hit != 'true'
-      env:
-        SKIP_COMPILE: true

.github/workflows/checks.yml

@@ -56,6 +56,9 @@ jobs:
           fetch-depth: 0 # Include history so patch conflicts are resolved automatically
       - name: Set up environment
         uses: ./.github/actions/setup
+      - name: Copy non-upgradeable contracts as dependency
+        run:
+          cp -rnT contracts node_modules/@openzeppelin/contracts
       - name: Transpile to upgradeable
         run: bash scripts/upgradeable/transpile.sh
       - name: Run tests