CI: Support uploading frontend unit test coverage. (#2772)

* CI: Support uploading frontend unit test coverage.

* Add make-i18n before test.

* Update vitest configuration to include only .ts and .tsx files in coverage.

* remove .only in test and fix the failed tests.

* Add text summary.

* Move vite-tsconfig-paths to dev dep. Adjust UTs.

---------

Signed-off-by: ifuryst <ifuryst@gmail.com>
Co-authored-by: sp.wack <83104063+amanape@users.noreply.github.com>

.github/workflows/run-unit-tests.yml

@@ -19,6 +19,35 @@ env:
   PERSIST_SANDBOX : "false"
 
 jobs:
+  fe-test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [20]
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install dependencies
+        working-directory: ./frontend
+        run: npm ci
+
+      - name: Run tests and collect coverage
+        working-directory: ./frontend
+        run: npm run test:coverage
+
+      - name: Upload coverage to Codecov
+        uses: codecov/codecov-action@v4
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+
   test-on-macos:
     name: Test on macOS
     runs-on: macos-12