feat(env): prevent duplicated PATH from fnm env

[fabricionaweb]

As previous discussed on #1309 (and maybe somewhere else), the current behavior is to always make a new symlink and append this new folder to PATH.

While I understand this works fine and one usually does not call fnm env multiple times for a shell session, I believe this has room to improve...

I made this change to be less aggressive. I didn't touch other variables and just attacking these two variables that are mutable and related.

On this PR I propose:

• fnm env will look for fnm_multishells on the environment variable $PATH.
  • If found it will not print the PATH variable, thus preventing it to be duplicated.
  • It also uses the value for set FNM_MULTISHELL_PATH (but stripes out the /bin)

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