Remove Micronaut Parent Context

[codeconsole]

Requires grails/grails-testing-support#421 for tests to work

[matrei]

Hmm..., was this PR ready to be merged?

[davydotcom]

yes

[matrei]

😄 It's breaking the test suite, so now we can't do any other changes and rely on the tests

[jamesfredley]

After the merge and grails/grails-testing-support#421 (review) being addressed, it revealed a number of currently failing tests on grails-core. Here are some of the higher priority failures.

DataBindingConfigurationSpec
[Test worker] ERROR grails.plugins.DefaultGrailsPluginManager - ERROR: Plugin [domainClass] cannot be loaded because its dependencies [['i18n']] cannot be resolved
[Test worker] ERROR grails.plugins.DefaultGrailsPluginManager - ERROR: Plugin [converters] cannot be loaded because its dependencies [['controllers', 'domainClass']] cannot be resolved
[Test worker] ERROR grails.plugins.DefaultGrailsPluginManager - ERROR: Plugin [mimeTypes] cannot be loaded because its dependencies [['core', 'controllers']] cannot be resolved

RespondMethodSpec
[Test worker] WARN org.grails.datastore.mapping.core.DatastoreUtils - Cannot unbind session, there's no SessionHolder registered

GrailsWebDataBinderConfigurationSpec
No signature of method: org.grails.spring.context.support.PluginAwareResourceBundleMessageSource.addMessage() is applicable for argument types: (String, Locale, String) values: [my.date.format, en_US, MMddyyyy]

GrailsUnitTestMixinGrailsApplicationAwareSpec
java.lang.NullPointerException: Cannot get property 'grailsApplication' on null object