Grails 7: grails-testing-support remove beanExcludes

[jamesfredley]

beanExcludes isn't used anymore, and can be removed. It was used for configuring the Micronaut context.

#430 (comment)

[codeconsole]

        def beanExcludes = [ConversionService, Environment, PropertyResolver, ConfigurableEnvironment]
        def objectMapper = ClassUtils.forName('com.fasterxml.jackson.databind.ObjectMapper', context.getClassLoader())
        if (objectMapper) {
            beanExcludes.add(objectMapper)
        }

[codeconsole]

#435