Start diagnostic group_id at 1 to handle non LS diagnostics (#22694)

In particular, `DiagnosticPopover` both:

* Supports moving the selection to a diagnostic when clicked, based on
`group_id`

* Provides Diagnostic values with `group_id: 0` providing informztion on
hover about invisible characters.

So, clicking such a popover would navigate to the very first error
produced by a language server. Really not a big deal of course, but
seems good to fix as it might result in surprising behavior in other
future circumstances

Release Notes:

- N/A

crates/project/src/lsp_store.rs

@@ -2960,7 +2960,7 @@ impl LspStore {
                 http_client,
                 fs,
                 yarn,
-                next_diagnostic_group_id: Default::default(),
+                next_diagnostic_group_id: 1,
                 diagnostics: Default::default(),
                 _subscription: cx.on_app_quit(|this, cx| {
                     this.as_local_mut().unwrap().shutdown_language_servers(cx)