Revise GitHub workflows (#9011)

* Fix check for changed files & reformat workflows

* Test performance of paths-filter action

* Revise workflows

* Better wording

* Fix naming of "Pre-Check"

* Point out values

* Abreviate to make it look cleaner in report

.github/workflows/unit-tests.yml

@@ -0,0 +1,33 @@
+name: Unit Tests
+
+on:
+  workflow_call:
+
+jobs:
+  test:
+    name: Test (Node.js ${{ matrix.node-version }})
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        node-version:
+          - '16'
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Setup Node.js
+        uses: actions/setup-node@v2
+        with:
+          node-version: ${{ matrix.node-version }}
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Build packages
+        run: npm run build
+
+      - name: Run tests
+        run: npm run test
+        env:
+          SECRET: TEST_SECRET