fix(mapping): Use CWRType insteand of CWRelation

because of yams
5 jobs for branch/default in 52 seconds (queued for 4 seconds)
Name Stage Failure
failed
mypy Lint
owl2yams/schema_uri.py:1: error: Skipping analyzing "yams.buildobjs": found module but no type hints or library stubs
owl2yams/schema_uri.py:1: note: See https://mypy.readthedocs.io/en/stable/running_mypy.html#missing-imports
owl2yams/schema_uri.py:4: error: Name "RelationDefinition" is not defined
Found 2 errors in 1 file (checked 3 source files)
ERROR: InvocationError for command /builds/cubicweb/owl2yams/.tox/mypy/bin/mypy --install-types --non-interactive owl2yams (exited with code 1)
___________________________________ summary ____________________________________
ERROR: mypy: commands failed
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1
failed
flake8 Lint
ERROR: InvocationError for command /builds/cubicweb/owl2yams/.tox/flake8/bin/flake8 (exited with code 1)
___________________________________ summary ____________________________________
ERROR: flake8: commands failed
Uploading artifacts for failed job
Uploading artifacts...
WARNING: gl-code-quality-report.json: no matching files
ERROR: No files to upload
Cleaning up file based variables
ERROR: Job failed: command terminated with exit code 1