Same python env reported twice on Codespaces

[DonJayamanne]

Fixed in Native Locator, but in stable locator, we list the same env twice.

/usr/local/python;/current/bin/python == /usr/local/python;/current/bin/python3

[DonJayamanne]

@karthiknadig only listing these as, these are cases where comparing the count of envs against native locator envs would be different as in some cases such as this the envs reported by stable locator are incorrect.