Lists the Python environments available on the system so you can see which
name to pass to talkrpp_initialize() / talkTranscribeDiarise()
(condaenv) or talkrpp_install() (envname). Unlike
find_talkrpp_env, which only reports whether the default env
exists, this returns the actual environment names.
Value
A character vector of environment names: all conda environments,
followed by any virtualenvs. character(0) if none are found (or if
no conda binary is available and there are no virtualenvs).

