Handle package containing different deps, each containing an app of same name

Describe the bug

kaggle contains two separate deps: slugify and python-slugify. Each of these separate python packages contain an app with the name slugify.

When pipx catalogs all of the apps_of_dependencies it lists slugify twice in the list because it comes from separate dependencies.

If pipx installs kaggle with switch --include-deps it tries to write the slugify link twice, once from each dep. It gives the following warning during install:

  Overwriting file C:\Users\mclapp\.local\bin\slugify with C:\Users\mclapp\.local\pipx\venvs\kaggle\Scripts\slugify

Then on uninstall, when going through the lists of apps_of_dependencies, it will encounter slugify twice. The first time it removes the binary from the pipx bin directory, and the second time when it tries to remove a non-existent file, on Windows it throws a python error and sends the user a stack trace (see below).

Solving the symptom is probably pretty easy: don't try and delete a non-existent file on Windows. macos and linux already have much more extensive checks whether the file exists in their symlink-centric part of the code.

Going further upstream, we could also make sure that we pass apps_of_dependencies through a set() to eliminate redundant entries. I'm curious if there are other thoughts on handling this annoying edge case properly.

How to reproduce

formica:pipx pipx install kaggle==1.5.9 --include-deps
  Overwriting file C:\Users\mclapp\.local\bin\slugify with C:\Users\mclapp\.local\pipx\venvs\kaggle\Scripts\slugify
done!
creating virtual environment...
installing kaggle from spec 'kaggle==1.5.9'...
  installed package kaggle 1.5.9, Python 3.9.0
  These apps are now globally available
    - chardetect.exe
    - kaggle.exe
    - slugify
    - slugify.exe
    - tqdm.exe
formica:pipx pipx uninstall kaggle
Traceback (most recent call last):
  File "c:\program files\python39\lib\runpy.py", line 197, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\program files\python39\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\mclapp\AppData\Roaming\Python\Python39\Scripts\pipx.exe\__main__.py", line 7, in <module>
  File "C:\Users\mclapp\AppData\Roaming\Python\Python39\site-packages\pipx\main.py", line 609, in cli
    return run_pipx_command(parsed_pipx_args)
  File "C:\Users\mclapp\AppData\Roaming\Python\Python39\site-packages\pipx\main.py", line 192, in run_pipx_command
    return commands.uninstall(venv_dir, constants.LOCAL_BIN_DIR, verbose)
  File "C:\Users\mclapp\AppData\Roaming\Python\Python39\site-packages\pipx\commands\uninstall.py", line 62, in uninstall
    file.unlink()
  File "c:\program files\python39\lib\pathlib.py", line 1343, in unlink
    self._accessor.unlink(self)
FileNotFoundError: [WinError 2] The system cannot find the file specified: 'C:\\Users\\mclapp\\.local\\bin\\slugify'
formica:pipx

Expected behavior

No stacktrace.