Switch from ./gradlew to gradle command in GitHub Actions

This change transitions the use of commands from './gradlew' to 'gradle' in the GitHub Actions workflow file (main.yml). Gradle setup now uses 'gradle-build-action@v2', and the naming of the test script execution has been modified for better clarity.

.github/workflows/main.yml

@@ -39,7 +39,7 @@ jobs:
         uses: gradle/gradle-build-action@v2
 
       - name: Install Dependencies
-        run: ./gradlew resolveDependencies
+        run: gradle resolveDependencies
 
       - name: Run tests
-        run: ./gradlew test -i
+        run: gradle test -i