Relaxed plugin validation and errors (false positive)

I do believe that it is essential for the Quarkus plugin to be relaxed about raising errors when they are not 100% sure (totally avoiding false positive).

The plugin is here as a helper to make things easier and quicker, the validation is a nice to have (and should be best effort). When there is the question of raising an error, the plugin should:

• if this is a guaranteed error, raise it
• if this is a possible error or missing value, show a very light warning

Anyway Quarkus build is here as backup to make sure everything is fine for the user.

This is a false positive:

This is a good weak warning:

The issue does not name a file, test, or entry point. Start by reproducing the shown false-positive validation and tracing the plugin's error and warning reporting paths; done means guaranteed errors still raise errors while possible errors or missing values produce only light warnings.