ci: temporarily enable Sauce Labs browser test job in PR workflow

This commit temporarily enables the Sauce Labs Browser Compatibility Tests job
in .github/workflows/pr.yml so that we can test the Sauce Connect 5 CI
upgrade workflow on pull request execution in GitHub Actions.

Once the PR CI check is verified green, this step can be reverted.

TAG=agy
CONV=364b9a2f-e7e4-4f68-9f2a-92ecc5151b67

Author: alan-agius4

.github/workflows/pr.yml

@@ -214,3 +214,31 @@ jobs:
         uses: angular/dev-infra/github-actions/bazel/configure-remote@24ba9709ca4bf6548bba6a9abfe2799e90645a60 # main
       - name: Run CLI E2E tests
         run: pnpm bazel test --test_env=E2E_SHARD_TOTAL=6 --test_env=E2E_SHARD_INDEX=${{ matrix.shard }} --config=e2e //tests:e2e.snapshots.${{ matrix.subset }}_node${{ matrix.node }}
+
+  browsers:
+    needs: build
+    runs-on: ubuntu-latest
+    name: Browser Compatibility Tests
+    env:
+      SAUCE_TUNNEL_IDENTIFIER: angular-cli-${{ github.workflow }}-${{ github.run_number }}
+    steps:
+      - name: Initialize environment
+        uses: angular/dev-infra/github-actions/npm/checkout-and-setup-node@24ba9709ca4bf6548bba6a9abfe2799e90645a60 # main
+      - name: Install node modules
+        run: pnpm install --frozen-lockfile
+      - name: Setup Bazel
+        uses: angular/dev-infra/github-actions/bazel/setup@24ba9709ca4bf6548bba6a9abfe2799e90645a60 # main
+      - name: Setup Bazel RBE
+        uses: angular/dev-infra/github-actions/bazel/configure-remote@24ba9709ca4bf6548bba6a9abfe2799e90645a60 # main
+      - name: Start Sauce Connect
+        uses: saucelabs/sauce-connect-action@cb88b508c6f9ff4d84490093733315dbd55de022 # v3
+        with:
+          username: ${{ vars.SAUCE_USERNAME }}
+          accessKey: ${{ secrets.SAUCE_ACCESS_KEY }}
+          region: us-west
+          tunnelName: ${{ env.SAUCE_TUNNEL_IDENTIFIER }}
+      - name: Run E2E Browser tests
+        env:
+          SAUCE_USERNAME: ${{ vars.SAUCE_USERNAME }}
+          SAUCE_ACCESS_KEY: ${{ secrets.SAUCE_ACCESS_KEY }}
+        run: pnpm bazel test --config=saucelabs //tests:e2e.saucelabs