Reduce Config startup footprint

[radcortez]

Remove some of the overhead added by #26802:

• Generate static blocks with config defaults instead of properties files
• Remove the validation Config instance and add the ability to disable config sources to perform the validaiton

[quarkus-bot]

Failing Jobs - Building ebe995a

Status	Name	Step	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 11
✖	JVM Tests - JDK 11 Windows	Build	Failures	Logs	Raw logs
✔️	JVM Tests - JDK 17
✖	JVM Tests - JDK 17 MacOS M1	Set up runner	⚠️ Check →	Logs	Raw logs
✔️	JVM Tests - JDK 18

Full information is available in the Build summary check run.

Failures

⚙️ JVM Tests - JDK 11 Windows #

- Failing: extensions/smallrye-reactive-messaging-amqp/deployment 
! Skipped: integration-tests/reactive-messaging-amqp 

📦 extensions/smallrye-reactive-messaging-amqp/deployment

✖ io.quarkus.smallrye.reactivemessaging.amqp.devmode.nohttp.AmqpDevModeNoHttpTest.testConsumerUpdate - More details - Source on GitHub

java.util.concurrent.RejectedExecutionException
	at org.jboss.threads.RejectingExecutor.execute(RejectingExecutor.java:38)
	at org.jboss.threads.EnhancedQueueExecutor.rejectShutdown(EnhancedQueueExecutor.java:2076)

[rsvoboda]

I think this could be a good candidate for the next 2.13 release, adding backport label

[gsmet]

We won't backport this to 2.13 as we think it's too risky.