Fix nightly workflow file name

Author: jfdenise

.github/workflows/testing-workflow-jdk11.yml renamed to .github/workflows/nightly-workflow-jdk11.yml

@@ -1,7 +1,7 @@
 # This workflow will build a Java project with Maven
 # For more information see: https://help.github.com/actions/language-and-framework-guides/building-and-testing-java-with-maven
 
-name: WildFly galleon plugins testing
+name: Nightly WildFly backward compatibility with JDK11, used up to WF 34.
 
 on:
   workflow_call: