fix: skip configure env for SelfCommand (#6225)

At the moment a venv is created on running a `poetry self` command. Even if it is not used in the command itself it's unnecessary and lead to problems as reported in #6222. This PR fixes this.

Resolves: #6222

Author: finswimmer

src/poetry/console/application.py

@@ -276,9 +276,10 @@ def configure_env(
         self, event: ConsoleCommandEvent, event_name: str, _: Any
     ) -> None:
         from poetry.console.commands.env_command import EnvCommand
+        from poetry.console.commands.self.self_command import SelfCommand
 
         command = event.command
-        if not isinstance(command, EnvCommand):
+        if not isinstance(command, EnvCommand) or isinstance(command, SelfCommand):
             return
 
         if command._env is not None: