Remove legacy config classes support from extension annotation processor

[gsmet]

This is a follow-up of #48717 and should only be merged when 3.25 is branched and #48717 is merged.

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Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 44efba0.

Failing Jobs

Status	Name	Step	Failures	Logs	Raw logs	Build scan
✖	Native Tests - Windows support	Build	Failures	Logs	Raw logs	🔍

You can consult the Develocity build scans.

Failures

⚙️ Native Tests - Windows support #

- Failing: integration-tests/liquibase 

📦 integration-tests/liquibase

✖ Failed to execute goal io.quarkus:quarkus-maven-plugin:999-SNAPSHOT:build (default) on project quarkus-integration-test-liquibase: Failed to build quarkus application

---

Flaky tests - Develocity

⚙️ JVM Integration Tests - JDK 17 Windows

📦 integration-tests/grpc-hibernate

✖ com.example.grpc.hibernate.BlockingRawTest.shouldAdd - History

• Condition with Lambda expression in com.example.grpc.hibernate.BlockingRawTestBase was not fulfilled within 30 seconds. - org.awaitility.core.ConditionTimeoutException

org.awaitility.core.ConditionTimeoutException: Condition with Lambda expression in com.example.grpc.hibernate.BlockingRawTestBase was not fulfilled within 30 seconds.
	at org.awaitility.core.ConditionAwaiter.await(ConditionAwaiter.java:167)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:78)
	at org.awaitility.core.CallableCondition.await(CallableCondition.java:26)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1160)
	at org.awaitility.core.ConditionFactory.until(ConditionFactory.java:1129)
	at com.example.grpc.hibernate.BlockingRawTestBase.shouldAdd(BlockingRawTestBase.java:59)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)

---

⚙️ JVM Integration Tests - JDK 21

📦 integration-tests/virtual-threads/grpc-virtual-threads

✖ io.quarkus.grpc.example.streaming.VertxVirtualThreadTest.testStreamingOutputCall - History

• INTERNAL: Half-closed without a request - io.grpc.StatusRuntimeException

io.grpc.StatusRuntimeException: INTERNAL: Half-closed without a request
	at io.grpc.Status.asRuntimeException(Status.java:532)
	at io.grpc.stub.ClientCalls$BlockingResponseStream.hasNext(ClientCalls.java:631)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:132)
	at io.quarkus.grpc.example.streaming.VirtualThreadTestBase.testStreamingOutputCall(VirtualThreadTestBase.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at io.quarkus.test.junit.QuarkusTestExtension.runExtensionMethod(QuarkusTestExtension.java:1000)
	at io.quarkus.test.junit.QuarkusTestExtension.interceptTestMethod(QuarkusTestExtension.java:848)