Fix handling of --system-specs argument so it happens before Application::new (#29240)

Fixes issue described in [description of
#28683](https://github.com/zed-industries/zed/issues/28683#issue-2992849891)

Makes sure that the `--system-specs` arg is handled before
`Application::new` is called, so that it can be used even when Zed is
panicking during app initialization (e.g. Failing to create a Vulkan
context in blade)

Release Notes:

- Fixed an issue where the `--system-specs` arg wouldn't work if Zed
panicked during app initialization (e.g. When failing to create a Vulkan
context in blade)

crates/release_channel/src/lib.rs

@@ -63,8 +63,8 @@ impl Global for GlobalAppVersion {}
 pub struct AppVersion;
 
 impl AppVersion {
-    /// Initializes the global [`AppVersion`].
-    pub fn init(pkg_version: &str) -> SemanticVersion {
+    /// Load the app version from env.
+    pub fn load(pkg_version: &str) -> SemanticVersion {
         if let Ok(from_env) = env::var("ZED_APP_VERSION") {
             from_env.parse().expect("invalid ZED_APP_VERSION")
         } else {