[test] Move all API v1 algorithms to their own folder

This implies update of tests using them as well as
experiments.

This will allow clean separation with API v2 algorithms
and will make testing other elements of the platform
easier.
2 jobs for reorganize_v1_related_prefix_content in 15 minutes and 45 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #168504
docker-build
build_linux_36

00:14:26

64.0%
passed #168505
macosx
build_macosx_36

00:15:41

64.0%