Generate application.yaml when quarkus-config-yaml extension is enabled during generation

[BiggA94]

Description
If I generate a new Quarkus application and I am using the quarkus-config-yaml extension, a application.properties file is generated.
I would assume that users that are using the quarkus-config-yaml extension rather want to use application.yaml file.
(Could be extended if CodeStarts are implemented)

Implementation ideas
Since the generated application.properties file is empty anways, it would be enough, to only change to filename on generation from application.properties to application.yaml at code generation.

[gastaldi]

@ia3andy this one is for you, I presume

[geoand]

This has already been fixed - I just tested an application generated from code.quarkus.io