feat(windows): enable crash handling on release builds (#3441)

Since #3263 closed, we could enable crash handling for release builds on
Windows, too.
This should get rid of a dead code warning in CI:


![image](https://github.com/firezone/firezone/assets/13400041/7a6cd0ed-5943-4fa5-a23f-1426aa438f51)

Signed-off-by: Reactor Scram <ReactorScram@users.noreply.github.com>

rust/windows-client/src-tauri/src/client/crash_handling.rs

@@ -20,7 +20,6 @@ const SOCKET_NAME: &str = "dev.firezone.client.crash_handler";
 /// <https://github.com/EmbarkStudios/crash-handling/blob/main/minidumper/examples/diskwrite.rs>
 /// Linux has a special `set_ptracer` call that is handy
 /// MacOS needs a special `ping` call to flush messages inside the crash handler
-#[cfg(all(debug_assertions, target_os = "windows"))]
 pub(crate) fn attach_handler() -> Result<CrashHandler> {
     // Attempt to connect to the server
     let (client, _server) = start_server_and_connect()?;
@@ -39,11 +38,6 @@ pub(crate) fn attach_handler() -> Result<CrashHandler> {
     Ok(handler)
 }
 
-#[cfg(not(debug_assertions))]
-pub(crate) fn attach_handler() -> Result<CrashHandler> {
-    bail!("crash handling is disabled in release builds for now");
-}
-
 /// Main function for the server process, for out-of-process crash handling.
 ///
 /// The server process seems to be the preferred method,