New Failing Tests on 9.0.0

[jamesfredley]

Groovy-5106(domain inheritance) issues:

The interface GormEntity cannot be implemented more than once with different arguments: org.grails.datastore.gorm.GormEntity<grails.gorm.tests.XXX> and org.grails.datastore.gorm.GormEntity<grails.gorm.tests.XXX>

https://github.com/grails/gorm-hibernate5/pull/878/files#diff-c17e8e625456e19789dac95321b96d288b570a3869500d5b6c892ddb89c12acd

examples-grails-data-service

General error during canonicalization: No signature of method: org.codehaus.groovy.ast.ClassCodeExpressionTransformer.transform() is applicable for argument types: (org.codehaus.groovy.ast.expr.MethodCallExpression) values: [org.codehaus.groovy.ast.expr.MethodCallExpression@776b49b2[object: org.codehaus.groovy.ast.expr.VariableExpression@30b9eadd[variable: response] method: org.codehaus.groovy.ast.expr.ConstantExpression@497570fb[status] arguments: org.codehaus.groovy.ast.expr.ArgumentListExpression@412c995d[org.codehaus.groovy.ast.expr.PropertyExpression@3249a1ce[object: org.codehaus.groovy.ast.expr.ClassExpression@4dd94a58[type: org.springframework.http.HttpStatus] property: org.codehaus.groovy.ast.expr.ConstantExpression@2f4919b0[UNPROCESSABLE_ENTITY]]]]]

https://github.com/grails/gorm-hibernate5/pull/878/files#diff-7f825392aa37acd1cee0c2e7b9bb7366ad6eac64f3e6cdd816e156bcb69d30de
https://github.com/grails/gorm-hibernate5/pull/878/files#diff-12879bcb16768df7b12cc0afc7feb7dec6daac16cc78ab20d97a86461a37771f
java.lang.IllegalStateException: Either class [example.Customer] is not a domain class or GORM has not been initialized correctly or has already been shutdown. Ensure GORM is loaded and configured correctly before calling any methods on a GORM entity.

https://github.com/grails/gorm-hibernate5/pull/878/files#diff-b959418ad6dfb5509464cf7b01fe22b84cf1d72f4756299d9382f2f5afded695

java.lang.IllegalStateException: Either class [example.Book] is not a domain class or GORM has not been initialized correctly or has already been shutdown. Ensure GORM is loaded and configured correctly before calling any methods on a GORM entity.
java.lang.IllegalStateException: Either class [example.Book] is not a domain class or GORM has not been initialized correctly or has already been shutdown. Ensure GORM is loaded and configured correctly before calling any methods on a GORM entity.

Additional currently failing tests.