[schema][toolchain][2] Remove loops from representation

The blocks entry covers them as it already covers both
the blocks and analysers. Therefore there's no need for
an additional property here.
5 jobs for clean_toolchain_representation in 32 minutes and 54 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #182113
docker-build
build_linux_36

00:12:59

64.0%
passed #182115
docker-build
build_linux_37

00:11:51

64.0%
passed #182111
macosx
build_macosx_36

00:20:57

64.0%
passed #182112
macosx
build_macosx_37

00:20:41

64.0%
failed #182114
docker-build
build_linux_37

00:12:38

64.0%