take into account branch, tag or rev on git dependencies

[sebhmg]

Problem

conda-lock does not take into account rev, branch or tag for a git dependency in pyprojet.toml
See reference in Poetry documentation about specifying the git revision: https://python-poetry.org/docs/dependency-specification/#git-dependencies

It only considers the revision when expressed in the url as url@rev

Fix

Checks both the url and the branch, tag or rev field. Raises an exception in case the information is specified both ways with different values.

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[maresb]

Thanks @sebhmg!

Would you be able to add some tests? You could add them to this pyproject.toml and update this test accordingly,