manager/pdm: do not add dep group to depName

[secustor]

PDM is not uses as expected and this creates for the user unexpected behaviour.

Currently dependencies which are located in a dependency group get the group name as prefix. This leads to that these dependencies are not group automatically with similar deps in other groups or managers.

[tool.pdm.dev-dependencies]
dev = ["pytest==8.0.0"]

e.g. #27372