Resolve cwd using os.path.realpath() when generating environment names (#6110)

* Resolve cwd using os.path.realpath() when generating environment names

* Add test_generate_env_name_uses_real_path() unit test

* ensure normcase

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci



Co-authored-by: Randy Döring <30527984+radoering@users.noreply.github.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>