Make slash commands more discoverable (#12480)

<img width="648" alt="image"
src="https://github.com/zed-industries/zed/assets/482957/a63df904-fbbe-4e0a-80b2-c98ebee90690">

Release Notes:

- N/A

Co-authored-by: Nathan <nathan@zed.dev>

crates/extension/src/extension_slash_command.rs

@@ -27,7 +27,7 @@ impl SlashCommand for ExtensionSlashCommand {
         self.command.description.clone()
     }
 
-    fn tooltip_text(&self) -> String {
+    fn menu_text(&self) -> String {
         self.command.tooltip_text.clone()
     }
 

crates/extension/src/extension_store.rs

@@ -1178,8 +1178,8 @@ impl ExtensionStore {
                     }
 
                     for (slash_command_name, slash_command) in &manifest.slash_commands {
-                        this.slash_command_registry
-                            .register_command(ExtensionSlashCommand {
+                        this.slash_command_registry.register_command(
+                            ExtensionSlashCommand {
                                 command: crate::wit::SlashCommand {
                                     name: slash_command_name.to_string(),
                                     description: slash_command.description.to_string(),
@@ -1188,7 +1188,9 @@ impl ExtensionStore {
                                 },
                                 extension: wasm_extension.clone(),
                                 host: this.wasm_host.clone(),
-                            });
+                            },
+                            false,
+                        );
                     }
                 }
                 this.wasm_extensions.extend(wasm_extensions);