Avoid repeatedly creating same DotNames in ResteasyReactiveProcessor

[gsmet]

This is a follow-up of #46464.

Given the purpose of the PR was to improve dev mode reload performance, I think it's worth avoiding the extra allocations.

[Postremus]

Thanks!

[quarkus-bot]

Status for workflow Quarkus CI

This is the status report for running Quarkus CI on commit 064f4c8.

✅ 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 Windows

📦 extensions/micrometer/deployment

✖ io.quarkus.micrometer.deployment.binder.VertxConnectionMetricsTest.testConnectionMetrics - History

• event executor terminated - java.util.concurrent.RejectedExecutionException

java.util.concurrent.RejectedExecutionException: event executor terminated
	at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:934)
	at io.netty.util.concurrent.SingleThreadEventExecutor.offerTask(SingleThreadEventExecutor.java:353)
	at io.netty.util.concurrent.SingleThreadEventExecutor.addTask(SingleThreadEventExecutor.java:346)
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:836)
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute0(SingleThreadEventExecutor.java:827)
	at io.netty.util.concurrent.SingleThreadEventExecutor.execute(SingleThreadEventExecutor.java:817)
	at io.vertx.core.impl.EventLoopExecutor.execute(EventLoopExecutor.java:35)