windows: Don't load login shell environment

[vilgotf]

I'm consistently getting the following error on startup:

2025-01-05T14:45:43.4602865+01:00 [ERROR] SHELL environment variable is not assigned so we can't source login environment variables

Caused by:
    environment variable not found

The source function, load_login_shell_environment, assumes a UNIX environment and should therefore not be called on Windows. (Unless you are using git bash?)

Release Notes:

• N/A

[0xtimsb]

I think a better way to handle this would be to manage it at the call site and handle imports.

In main.rs:

    if !stdout_is_a_pty() {
        app.background_executor()
            .spawn(async {
                #[cfg(unix)]
                {
                    load_shell_from_passwd().log_err();
                }
                load_login_shell_environment().log_err(); // move this in above block
            })
            .detach()
    };

In utils.rs:

#[cfg(unix)] // add it here
pub fn load_login_shell_environment() -> Result<()> {

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[SomeoneToIgnore]

Thank you.

Nice note about git bash, we might need to revisit it later, but it seems to be ok for now.