Improve handling of running hs create function when other .functions folders exist

[williamspiro]

If you run hs create function in a directory where an existing .functions folder might already exist, an error is thrown as we try and create the function inside the pre-existing .functions folder, even if it is not the CWD

In the above case, I would expect a /folder/b.functions folder be created, not /folder/a.functions/b.functions

[TheWebTech]

cc: @gcorne as we discussed this issue in the past

[williamspiro]

I just ran into this again and I think this is worth prioritizing fixing (after explore week 😄) as we work on increasing serverless adoption.

cc @gcorne @anthmatic @drewjenkins @miketalley @kemmerle

[drewjenkins]

After talking with @williamspiro we are unable to reproduce anymore