[BUG] Regression: pip.installed does not pass env_vars when calling pip.list to check if package is already installed

[redbaron4]

Description
This is a regression of #46127 and was introduced a few months after the original fix merged

See that bug for more details about how to reproduce the issue

Additional context

This commit made a change to cache the installed list using pip.list to speed up pip execution. However, the call to pip list does not pass env_vars (see 3003.1 code here) and hence the bug has reappeared.

pip_list = __salt__["pip.list"](bin_env=bin_env, user=user, cwd=cwd)

Fix is trivial by passing env_vars=env_vars to this function.

[smokeytheblair]

When this gets addressed, please note that **kwargs is also not being passed. Will want to confirm if that is also an issue.