Remove 'Destructive' prompts (#11631)

While these would match how macOS handles this scenario, they crash on
Catalina, and require mouse clicks to interact.

cc @bennetbo



Release Notes:

- N/A

crates/workspace/src/notifications.rs

@@ -263,7 +263,7 @@ impl Render for LanguageServerPrompt {
                                             PromptLevel::Warning => {
                                                 Some(DiagnosticSeverity::WARNING)
                                             }
-                                            PromptLevel::Critical | PromptLevel::Destructive => {
+                                            PromptLevel::Critical => {
                                                 Some(DiagnosticSeverity::ERROR)
                                             }
                                         }