Use Instant not chrono for telemetry (#20756)

We occasionally see dates in the future appearing in our telemetry. One
hypothesis is that this is caused by a clock change while Zed is running
causing date math based on chrono to be incorrect.

Instant *should* be a more stable source of relative timestamps.

Release Notes:

- N/A

crates/remote_server/src/remote_editing_tests.rs

@@ -1277,7 +1277,7 @@ fn build_project(ssh: Model<SshRemoteClient>, cx: &mut TestAppContext) -> Model<
 
     let client = cx.update(|cx| {
         Client::new(
-            Arc::new(FakeSystemClock::default()),
+            Arc::new(FakeSystemClock::new()),
             FakeHttpClient::with_404_response(),
             cx,
         )