Prevalidate presence of precommit cache tarball instead of hard failing (#49806)

Author: amoghrajesh

.github/actions/install-pre-commit/action.yml

@@ -61,6 +61,16 @@ runs:
         key: cache-pre-commit-v4-${{ inputs.python-version }}-${{ hashFiles('.pre-commit-config.yaml') }}
         path: /tmp/
       id: restore-pre-commit-cache
+    - name: "Check if pre-commit cache tarball exists"
+      shell: bash
+      run: |
+        if [ -f /tmp/cache-pre-commit.tar.gz ]; then
+          echo "✅ Cache tarball found: /tmp/cache-pre-commit.tar.gz"
+        else
+          echo "❌ Cache tarball missing. Expected /tmp/cache-pre-commit.tar.gz"
+          exit 1
+        fi
+      if: steps.restore-pre-commit-cache.outputs.stash-hit == 'true'
     - name: "Restore .cache from the tar file"
       run: tar -C ~ -xzf /tmp/cache-pre-commit.tar.gz
       shell: bash