Make sure versions are mocked in snapshots tests

[ia3andy]

Fixes #15142

[gsmet]

@glefloch a test is often failing for Gradle Windows: https://scans.gradle.com/s/uevlpnn7ufycc/tests/:test/io.quarkus.gradle.devmode.MultiModuleIncludedBuildTest/main()#1

I wonder if it could be related to the fast-jar change given we don't really expect a build/libs/ directory now but I'm not really sure given I only have seen it fail on Windows and not consistently.

[glefloch]

Yes I'm having a look, this is weird. The failing module is a dependency and gradle outputs jar to build/libs by default, so this shouldn't be related to the fat jar change.

[gsmet]

Thanks! Will try that for the next release.

[ia3andy]

@gsmet cool, sorry about this.

We need to be careful when switching code gen tests to snapshot testing, while it's easy to convert and gives a check of the whole file, most of them are not designed with mocks.