Use CI environment for clang/clazy

In order to be able to also do this with Qt6 we can't currently rely on 'random distro' to be able to give us an environment sufficient for running clang and clazy, so use the CI system setup instead

A side effect is that we get a newer clazy and clang-tidy and thus is a few more issues to either ignore or fix.

Also, ask ninja to continue as long as possible rather than stop at first error to be able to get succes in as few runs as possible