Gradle 8 compatability: compileWebappGroovyPages depends on copyAstClasses

[codeconsole]

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[codeconsole]

@jamesfredley this is breaking

org.gradle.api.plugins.InvalidPluginException: An exception occurred applying plugin request [id: 'org.grails.grails-gsp', version: '7.0.0-SNAPSHOT']
    at org.gradle.plugin.use.internal.DefaultPluginRequestApplicator.exceptionOccurred(DefaultPluginRequestApplicator.java:179)

An exception occurred applying plugin request [id: 'org.grails.grails-gsp', version: '7.0.0-SNAPSHOT']
> Failed to apply plugin 'org.grails.grails-gsp'.
   > Cannot read the array length because "<local2>" is null

but adding this directly in the app build.gradle fixes

compileWebappGroovyPages.dependsOn(copyAstClasses)

* What went wrong:
A problem was found with the configuration of task ':compileWebappGroovyPages' (type 'GroovyPageForkCompileTask').
  - Gradle detected a problem with the following location: '/Users/sheiberg/Documents/workspace/grails-plugin-sitemesh3/build/classes/groovy/main'.
    
    Reason: Task ':compileWebappGroovyPages' uses this output of task ':copyAstClasses' without declaring an explicit or implicit dependency. This can lead to incorrect results being produced, depending on what order the tasks are executed.
    
    Possible solutions:
      1. Declare task ':copyAstClasses' as an input of ':compileWebappGroovyPages'.
      2. Declare an explicit dependency on ':copyAstClasses' from ':compileWebappGroovyPages' using Task#dependsOn.
      3. Declare an explicit dependency on ':copyAstClasses' from ':compileWebappGroovyPages' using Task#mustRunAfter.
    
    For more information, please refer to https://docs.gradle.org/8.10.1/userguide/validation_problems.html#implicit_dependency in the Gradle documentation.

@matrei you have any thoughts on what causes the above exception and how to fix it directly in the plugin?

[jamesfredley]

@codeconsole give #332 a try. This one was more complicated than normal since the two tasks did not always exist at the same time and required a try/catch.