and use it to the generate a 'cmdbts2' test case strictly equivalent
to the CMDBTS repo.
Replace the previous CMDBTS dataset by this generated 'cmdbts2' dataset.
See the swh/provenance/tests/data/README.md file for more details.
Note: this revision could be split in 2 or 3, but...
Also remove test_provenance_heuristics_CMDBTS test
since it's redundant with the cmdbts2 test, now generated from a simple
yaml file rather than depending on the original CMDBTS git repo on
github.
The CMDBTS dataset (CMDBTS.msgpack) is kept for now since it's still
used for other tests (e.g. test_provenance_db).
Depends on D5781