Buildbot to filter out experimental and bleeding edge builders

I expect it should be easy enough to implement a "main" filter.
The filter should include builders for platforms which we officially release + builders which a a part of branch protection + some those which actually matter, like fulltest and such.

The filter should not include platforms which are officially experimental, like apparently macos or amd64-ubuntu-2404-clang18-asan, and platforms which always fail and nobody cares, like s390x, and probably platforms which are run "just because", like centos-stream9.