Don't apply the Groovy plugin if it has already been applied. Fixes #10197

Author: graemerocher

grails-gradle-plugin/src/main/groovy/org/grails/gradle/plugin/core/GrailsGradlePlugin.groovy

@@ -83,7 +83,9 @@ class GrailsGradlePlugin extends GroovyPlugin {
 
     @CompileStatic
     void apply(Project project) {
-        super.apply(project)
+        if( project.tasks.findByName('compileGroovy') == null ) {
+            super.apply(project)
+        }
 
         configureProfile(project)