Snapcraft raises an internal error if there is a file called snap

[mr-cal]

Bug Description

Running a snapcraft command fail if there is a file called snap in the pwd.

To Reproduce

touch snap
snapcraft login

Environment

Snapcraft 8.6.0

snapcraft.yaml

n/a

Relevant log output

phelps@arch ~/f/tmp> ls
phelps@arch ~/f/tmp> touch snap
phelps@arch ~/f/tmp> snapcraft login
Traceback (most recent call last):
  File "/snap/snapcraft/13008/bin/snapcraft", line 8, in <module>
    sys.exit(main())
  File "/var/lib/snapd/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/application.py", line 479, in main
    app = create_app()
  File "/var/lib/snapd/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/application.py", line 455, in create_app
    app = Snapcraft(
  File "/var/lib/snapd/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/application.py", line 104, in __init__
    self._snapcraft_yaml_path: pathlib.Path | None = self._resolve_project_path(
  File "/var/lib/snapd/snap/snapcraft/13008/lib/python3.10/site-packages/snapcraft/application.py", line 160, in _resolve_project_path
    return super()._resolve_project_path(project_dir / "snap")
  File "/var/lib/snapd/snap/snapcraft/13008/lib/python3.10/site-packages/craft_application/application.py", line 325, in _resolve_project_path
    return (project_dir / f"{self.app.name}.yaml").resolve(strict=True)
  File "/var/lib/snapd/snap/snapcraft/13008/usr/lib/python3.10/pathlib.py", line 1077, in resolve
    s = self._accessor.realpath(self, strict=strict)
  File "/var/lib/snapd/snap/snapcraft/13008/bin/../usr/lib/python3.10/posixpath.py", line 396, in realpath
    path, ok = _joinrealpath(filename[:0], filename, strict, {})
  File "/var/lib/snapd/snap/snapcraft/13008/bin/../usr/lib/python3.10/posixpath.py", line 431, in _joinrealpath
    st = os.lstat(newpath)
NotADirectoryError: [Errno 20] Not a directory: '/home/phelps/files/tmp/snap/snapcraft.yaml'
phelps@arch ~/f/tmp [1]> rm snap
phelps@arch ~/f/tmp> snapcraft login
Enter your Ubuntu One e-mail address and password.
If you do not have an Ubuntu One account, you can create one at https://snapcraft.io/accountz

Additional context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3773.

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