Fix ambiguous bean resolution for sub resource interfaces with multiple implementations

[Postremus]

Sub resource interfaces need to be scanned because of tests like this https://github.com/quarkusio/quarkus/blob/main/extensions/resteasy-reactive/rest/deployment/src/test/java/io/quarkus/resteasy/reactive/server/test/resource/basic/resource/ResourceLocatorBaseResource.java#L50

Essentially, no implemting class of the interface exists, only a Proxy.newProxyInstance. The spec does not mention that this is allowed. I have personally never seen anyone use this sort of pattern - but this is a test that was copied from resteasy classic. So propably someone does use this.

So instead of removing the test, and not scanning the sub resource interface anymore for the resource methods, no endpoint factory is created anymore for interfaces.
The result of a sub resource locator method, where the interface might have been used in practice, already returns an instance. So there is need for the endpoint factory for interfaces.

The same might be true for abstract classes with multiple implementations. However, #47003, prevents the ambiguous bean resolution error for them. I added a test case for abstract classes, to make sure they stay working at least.

closes #47107

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 558299b.

✅ The latest workflow run for the pull request has completed successfully.

It should be safe to merge provided you have a look at the other checks in the summary.

You can consult the Develocity build scans.

---

Flaky tests - Develocity

⚙️ JVM Integration Tests - JDK 17

📦 integration-tests/injectmock

✖ io.quarkus.it.mockbean.PerClassSpyTest.testWithoutSpy - History

• Mock accessed after inline mocks were cleared - org.mockito.exceptions.misusing.DisabledMockException

org.mockito.exceptions.misusing.DisabledMockException: Mock accessed after inline mocks were cleared
	at io.quarkus.it.mockbean.PerClassSpyTest$IdentityService.call(PerClassSpyTest.java:43)
	at io.quarkus.it.mockbean.PerClassSpyTest.testWithoutSpy(PerClassSpyTest.java:36)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at io.quarkus.test.junit.QuarkusTestExtension.runExtensionMethod(QuarkusTestExtension.java:1026)
	at io.quarkus.test.junit.QuarkusTestExtension.interceptTestMethod(QuarkusTestExtension.java:873)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

---

⚙️ JVM Integration Tests - JDK 17 Windows

📦 integration-tests/injectmock

✖ io.quarkus.it.mockbean.PerClassSpyTest.testWithoutSpy - History

• Mock accessed after inline mocks were cleared - org.mockito.exceptions.misusing.DisabledMockException

org.mockito.exceptions.misusing.DisabledMockException: Mock accessed after inline mocks were cleared
	at io.quarkus.it.mockbean.PerClassSpyTest$IdentityService.call(PerClassSpyTest.java:43)
	at io.quarkus.it.mockbean.PerClassSpyTest.testWithoutSpy(PerClassSpyTest.java:36)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at io.quarkus.test.junit.QuarkusTestExtension.runExtensionMethod(QuarkusTestExtension.java:1026)
	at io.quarkus.test.junit.QuarkusTestExtension.interceptTestMethod(QuarkusTestExtension.java:873)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1511)

---

⚙️ JVM Integration Tests - JDK 21

📦 integration-tests/injectmock

✖ io.quarkus.it.mockbean.PerClassSpyTest.testWithoutSpy - History

• Mock accessed after inline mocks were cleared - org.mockito.exceptions.misusing.DisabledMockException

org.mockito.exceptions.misusing.DisabledMockException: Mock accessed after inline mocks were cleared
	at io.quarkus.it.mockbean.PerClassSpyTest$IdentityService.call(PerClassSpyTest.java:43)
	at io.quarkus.it.mockbean.PerClassSpyTest.testWithoutSpy(PerClassSpyTest.java:36)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at io.quarkus.test.junit.QuarkusTestExtension.runExtensionMethod(QuarkusTestExtension.java:1026)
	at io.quarkus.test.junit.QuarkusTestExtension.interceptTestMethod(QuarkusTestExtension.java:873)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
	at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)

[geoand]

Thanks!