poetry run gives a cryptic FileNotFoundError if the command does not exist

[SeriousBug]

• I have searched the issues of this repo and believe that this is not a duplicate.
• I have searched the documentation and believe that my question is not covered.

Feature Request

Consider the following run:

$ poetry run does-not-exist

  FileNotFoundError

  [Errno 2] No such file or directory

  at /usr/lib/python3.9/os.py:607 in _execvpe
       603│         path_list = map(fsencode, path_list)
       604│     for dir in path_list:
       605│         fullname = path.join(dir, file)
       606│         try:
    →  607│             exec_func(fullname, *argrest)
       608│         except (FileNotFoundError, NotADirectoryError) as e:
       609│             last_exc = e
       610│         except OSError as e:
       611│             last_exc = e

This is confusing to look at. It would make sense to provide an actual error message if a package is missing. Something like the following would be much better:

$ poetry run does-not-exist

Error: Command does-not-exist doesn't exist. Please check that it is installed, and that the command name is spelled correctly.

[dimaqq]

The label should be bug or cleanup or maybe improvement. Not a feature 🤔

[pbsds]

Related: #4963 #3541 #2455

[branchvincent]

Appreciate the report! There are quite a few issues around this so I'm going to mark it as a duplicate of #1567, but note I'm currently working on a fix

[github-actions]

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