GrailsGradlePlugin.enableFileWatch should only include micronaut-inject-groovy in developmentOnly

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Task List

[X] Steps to reproduce provided
[X] Stacktrace (if present) provided
[ ] Example that reproduces the problem uploaded to Github
[X] Full description of the issue provided (see below)

Steps to Reproduce

The GrailsGradlePlugin.enableFileWatch() method currently brings in the micronaut-inject-groovy into the runtime configuration. It should only be included for developmentOnly. This occurs when you are building the Grails application into an executable JAR/WAR.

Backport the change from the 5.0 branch to 4.0.x so that the method is changed from:

protected void enableFileWatch(Environment environment, Project project) {
       if (environment.isReloadEnabled()) {
            project.configurations {
                agent
            }
            final String micronautVersion = project.properties['micronautVersion']
            project.dependencies.add("runtimeOnly", "io.micronaut:micronaut-inject-groovy:${micronautVersion?:defaultMicronautVersion}")
            project.afterEvaluate(new AgentTasksEnhancer())
        }
    }

to:

    protected void enableFileWatch(Environment environment, Project project) {
        if (environment.isReloadEnabled()) {
            project.configurations {
                agent
            }
            final String micronautVersion = project.properties['micronautVersion']
            if (project.configurations.findByName("developmentOnly")) {
                project.dependencies.add("developmentOnly", "io.micronaut:micronaut-inject-groovy:${micronautVersion?:defaultMicronautVersion}")
            }
            project.afterEvaluate(new AgentTasksEnhancer())
        }
    }

Expected Behaviour

micronaut-inject-groovy should not be inside of a production WAR/JAR file.

Actual Behaviour

when you assemble a WAR file, the micronaut-inject-groovy jar is included in the WAR which slows everything down.

Environment Information

Operating System: OSX Catalina
Grails Version: 4.0.10
JDK Version: AdoptOpenJDK 11
Container Version (If Applicable): N/A

grails / grails-gradle-plugin