Refactor tooltip and reviews-stars libraries; update CI workflow

- Updated the CI workflow to build and test only the "reviews-stars" project.
- Removed unnecessary test files for the "reviews-stars" and "tooltip" libraries.
- Changed the export of TooltipComponent from default to named export.

.gitea/workflows/test-pr.yml

@@ -31,7 +31,6 @@ jobs:
       - name: Install dependencies
         run: npm ci --legacy-peer-deps
       - name: Build libraries
-        run: npx nx run-many -t build
+        run: npx nx run-many -t build --projects="reviews-stars"
       - name: Run tests
-        run: npx nx run-many -t test --code-coverage --passWithNoTests
-
+        run: npx nx run-many -t test --code-coverage --passWithNoTests --projects="reviews-stars"