Should errors 405, 415, 500, 501, 502, 503, 504 be listed in CAMARA_common.yaml

[rartych]

Problem description
It was agreed in #321 not to include some 40X and 50X errors in API definitions.
Errors 405, 415, 500, 501, 502, 503, 504 are present in CAMARA_common.yaml

Expected behavior
Remove definitions from CAMARA_common.yaml

Alternative solution
Clarification if errors stay in CAMARA_common.yaml.

Additional context