ssh: Allow ssh -F ssh_config (#25619)

- Closes https://github.com/zed-industries/zed/issues/22818

Usage: `ssh -F ssh_config user@host.tld`

```
-F configfile
    Specifies an alternative per-user configuration file. If a configuration file
    is given on the command line, the system-wide configuration file
    (/etc/ssh/ssh_config) will be ignored. The default for the per-user
    configuration file is ~/.ssh/config. If set to “none”, no configuration files
    will be read.
```

Release Notes:

- ssh: Added support for specifying ssh_config files (`ssh -F
ssh_config`) in connection string

crates/remote/src/ssh_session.rs

@@ -146,7 +146,8 @@ impl SshConnectionOptions {
             "-4", "-6", "-A", "-a", "-C", "-K", "-k", "-X", "-x", "-Y", "-y",
         ];
         const ALLOWED_ARGS: &[&str] = &[
-            "-B", "-b", "-c", "-D", "-I", "-i", "-J", "-l", "-m", "-o", "-P", "-p", "-R", "-w",
+            "-B", "-b", "-c", "-D", "-F", "-I", "-i", "-J", "-l", "-m", "-o", "-P", "-p", "-R",
+            "-w",
         ];
 
         let mut tokens = shlex::split(input)