chore(🐙): improve cleanup of Dawn workspace in build workflow

Updated the build workflow to clean the Dawn workspace by deinitializing the git submodule before removing the directory.

Author: wcandillon

.github/workflows/build-dawn.yml

@@ -163,7 +163,9 @@ jobs:
     runs-on: self-hosted
     steps:
       - name: Clean previous Dawn workspace
-        run: rm -rf externals/dawn
+        run: |
+          git submodule deinit -f externals/dawn 2>/dev/null || true
+          rm -rf externals/dawn
 
       - name: Checkout main repository
         uses: actions/checkout@v6.0.2
@@ -191,6 +193,11 @@ jobs:
     runs-on: self-hosted
     needs: [prepare-release, mobile-android, mobile-apple]
     steps:
+      - name: Clean previous Dawn workspace
+        run: |
+          git submodule deinit -f externals/dawn 2>/dev/null || true
+          rm -rf externals/dawn
+
       - name: Checkout main repository
         uses: actions/checkout@v6.0.2