Improve/clean-up camel-quarkus-validator extension tests.

[svkcemk]

[aldettinger]

@svkcemk It's look good to me. Well done :+1:

Just one more thing. It's really nice to have separate commits during review. Before merging, it would be good to rebase all commits into a single one in order to help maintaining a clear git history.

Note that the FileTest failing in group_06 is not linked to this PR.

[svkcemk]

Thanks @aldettinger I was waiting for your review, now commits are squashed into one single commit.

[ppalaga]

Thanks @svkcemk !