.github: workflows: rust: Adopt cargo-nextest for parallel test execution

Install and use cargo nextest run in CI for parallel test execution.

Author: joaoantoniocardoso

.github/workflows/rust.yml

@@ -88,5 +88,8 @@ jobs:
           gstreamer1.0-libav \
           gstreamer1.0-plugins-ugly
 
+    - name: Install nextest
+      uses: taiki-e/install-action@nextest
+
     - name: Run tests
-      run: cargo test --verbose --locked
+      run: cargo nextest run --verbose --no-fail-fast --locked