Fix that the Codeium suggestion service was not recognizable

Author: intitni

Tool/Sources/CodeiumService/CodeiumExtension.swift

@@ -16,7 +16,7 @@ public final class CodeiumExtension: BuiltinExtension {
 
     public var suggestionServiceId: Preferences.BuiltInSuggestionFeatureProvider { .codeium }
 
-    public let suggestionService: CodeiumSuggestionService?
+    public let suggestionService: CodeiumSuggestionService
 
     public var chatTabTypes: [any ChatTab.Type] {
         [CodeiumChatTab.self]