Recalculate config property names during tests

[radcortez]

With #42715, the Config is initialized way earlier, which means that if the System source is mutated, the list of property names is not updated because it is cached.

Our assumption is that the Config is immutable, but we have these workarounds to pass the configuration around. Ideally, we shouldn't be mutating the configuration, which causes issues like:

• Test profile config properties can bleed into other test profiles #27996
• QuarkusTestResource not working with QuarkusMainLauncher #45868
• Assign random ports at configuration start (not later) #42986

Obviously, it is tricky to make that change now, and we are still trying to figure out how to handle the case of the port, but the goal is to completely remove the mutability of sources.

For now, I added a way to refresh the list of property names. Probably, a better way is to add some way to not cache the list of names for specific profiles, but that requires changes in SR Config, while this one can be done directly in Quarkus. I'll keep this in mind.

• Fixes QuarkusIntegrationTest: publishing a random port in the started container no longer works #46008

[quarkus-bot]

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