Fix parse error on attribute from @Inheritance superclass in spring-data extension

[famod]

Fixes the following exception when the method name targets an attribute from a SINGLE_TABLE superclass (here: key):

io.quarkus.spring.data.deployment.UnableToParseMethodException: Entity io.quarkus.it.spring.data.jpa.FederalStateCatalogValue does not contain a field named: key. Offending method is findByKey of Repository io.quarkus.it.spring.data.jpa.FederalStateCatalogValueRepository.
	at io.quarkus.spring.data.deployment.MethodNameParser.resolveNestedField(MethodNameParser.java:372)
	at io.quarkus.spring.data.deployment.MethodNameParser.parse(MethodNameParser.java:202)
	at io.quarkus.spring.data.deployment.generate.DerivedMethodsAdder.add(DerivedMethodsAdder.java:114)
	at io.quarkus.spring.data.deployment.generate.SpringDataRepositoryCreator.implementCrudRepository(SpringDataRepositoryCreator.java:116)
	at io.quarkus.spring.data.deployment.SpringDataJPAProcessor.implementCrudRepositories(SpringDataJPAProcessor.java:273)
	at io.quarkus.spring.data.deployment.SpringDataJPAProcessor.build(SpringDataJPAProcessor.java:107)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at io.quarkus.deployment.ExtensionLoader$2.execute(ExtensionLoader.java:820)
	at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
	at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
	at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2442)
	at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1476)
	at java.base/java.lang.Thread.run(Thread.java:834)
	at org.jboss.threads.JBossThread.run(JBossThread.java:501)

The test only covers SINGLE_TABLE but we can always iterate later on JOINED and TABLE_PER_CLASS.

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[geoand]

Thanks!