Add a way to import ssh host names from the ssh config (#30926)

Closes https://github.com/zed-industries/zed/issues/20016

Use `"read_ssh_config": false` to disable the new behavior.

Release Notes:

- Added a way to import ssh host names from the ssh config

---------

Co-authored-by: Cole Miller <m@cole-miller.net>

assets/settings/default.json

@@ -1715,6 +1715,8 @@
   //   }
   // ]
   "ssh_connections": [],
+  // Whether to read ~/.ssh/config for ssh connection sources.
+  "read_ssh_config": true,
   // Configures context servers for use by the agent.
   "context_servers": {},
   "debugger": {