Initialize MCP tools once at start up instead of every time we auth. (#3483)

packages/core/src/code_assist/converter.ts

@@ -80,6 +80,7 @@ interface VertexGenerateContentResponse {
   promptFeedback?: GenerateContentResponsePromptFeedback;
   usageMetadata?: GenerateContentResponseUsageMetadata;
 }
+
 export interface CaCountTokenRequest {
   request: VertexCountTokenRequest;
 }