Config Doc - Avoid annotations in primitive type name

[gsmet]

While this was already correctly handled for declared types, primitive types don't have an API to get the name without the annotations being present (toString() contains the annotations and there is no other way to get a string representation of the type...).

Fixing it by making sure we get to the type name.

This avoids having things like:
@io.smallrye.config.WithConverter(io.quarkus.runtime.init.InitRuntimeConfig.BooleanConverter.class) boolean in the doc.
Or Bean Validation constraints when they are used.

[github-actions]

🎊 PR Preview 2642c0b has been successfully built and deployed to https://quarkus-pr-main-42930-preview.surge.sh/version/main/guides/

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[quarkus-bot]

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[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 01ea052.

✅ 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.

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Flaky tests - Develocity

⚙️ JVM Tests - JDK 17

📦 extensions/resteasy-reactive/rest-client/deployment

✖ io.quarkus.rest.client.reactive.stork.StorkResponseTimeLoadBalancerTest.shouldUseFasterService - History

• expected: "hello, Alice" but was: "hello, I'm a slow server" - org.opentest4j.AssertionFailedError

org.opentest4j.AssertionFailedError: 

expected: "hello, Alice"
 but was: "hello, I'm a slow server"
	at io.quarkus.rest.client.reactive.stork.StorkResponseTimeLoadBalancerTest.shouldUseFasterService(StorkResponseTimeLoadBalancerTest.java:58)
	at java.base/java.lang.reflect.Method.invoke(Method.java:569)
	at io.quarkus.test.QuarkusUnitTest.runExtensionMethod(QuarkusUnitTest.java:499)
	at io.quarkus.test.QuarkusUnitTest.interceptTestMethod(QuarkusUnitTest.java:413)