Use one job to execute tests in CI

Author: syl20bnr

.github/workflows/ci.yml

@@ -38,10 +38,10 @@ jobs:
         uses: tracel-ai/github-actions/actions/check-typos@v1
       # --------------------------------------------------------------------------------
       - name: Unit Tests
-        run: cargo xtask test unit
+        run: cargo xtask test --jobs 1 unit
       # --------------------------------------------------------------------------------
       - name: Integration Tests
-        run: cargo xtask test integration
+        run: cargo xtask test --jobs 1 integration
       # --------------------------------------------------------------------------------
       - name: Documentation Tests
         run: cargo xtask doc tests