Pull app / OS info out of GPUI, add Linux information, make fallible window initialization (#12869)

TODO:
- [x] Finish GPUI changes on other operating systems 

This is a largely internal change to how we report data to our
diagnostics and telemetry. This PR also includes an update to our blade
backend which allows us to report errors in a more useful way when
failing to initialize blade.


Release Notes:

- N/A

---------

Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>

crates/gpui/src/platform/linux/headless/client.rs

@@ -59,10 +59,6 @@ impl LinuxClient for HeadlessClient {
         None
     }
 
-    fn can_open_windows(&self) -> anyhow::Result<()> {
-        return Err(anyhow::anyhow!("neither DISPLAY, nor WAYLAND_DISPLAY found. You can still run zed for remote development with --dev-server-token."));
-    }
-
     fn active_window(&self) -> Option<AnyWindowHandle> {
         None
     }
@@ -71,8 +67,14 @@ impl LinuxClient for HeadlessClient {
         &self,
         _handle: AnyWindowHandle,
         _params: WindowParams,
-    ) -> Box<dyn PlatformWindow> {
-        unimplemented!()
+    ) -> anyhow::Result<Box<dyn PlatformWindow>> {
+        Err(anyhow::anyhow!(
+            "neither DISPLAY nor WAYLAND_DISPLAY is set. You can run in headless mode"
+        ))
+    }
+
+    fn compositor_name(&self) -> &'static str {
+        "headless"
     }
 
     fn set_cursor_style(&self, _style: CursorStyle) {}