[cache] Add remove command to cache

This allows to clear the content of a specific block.

This allows to experiment re-runs to take advantage of the
cache up to the block that was cleaned.
4 jobs for add_cache_remove in 4 minutes and 22 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Build
passed #191928
docker-build
build_linux_36

00:02:54

55.0%
passed #191929
docker-build
build_linux_37

00:02:49

55.0%
passed #191926
macosx
build_macosx_36

00:04:22

55.0%
passed #191927
macosx
build_macosx_37

00:04:03

55.0%