Make `SpringBootDefaultPropertiesFinder` multi-module aware

[fabapp2]

What needs to be done

The Make SpringBootDefaultPropertiesFinder returns the first match which only works when the finder is applied to ProjectContext in single-module applications. If it gets applied to a multi-module application with multiple modules containing default properties it will return only the properties for one module.

A currently working workaround would be to apply the finder to the application modules explicitly like here

Why it needs to be done

As a Developer, I'd assume the finder works also with multi-module applications