[typespec-vscode] fix singature help test super slow

packages/compiler/src/server/serverlib.ts

@@ -165,6 +165,7 @@ export function createServer(
   const signatureHelpUpdateManager = new UpdateManager<CompileResult | undefined>(
     "signature-help",
     log,
+    () => 0,
   );
 
   const compileService = createCompileService({

packages/compiler/src/server/update-manager.ts

@@ -39,6 +39,7 @@ export class UpdateManager<T = void> {
   constructor(
     private name: string,
     log: (sl: ServerLog) => void,
+    getDelayCandidates?: () => number,
   ) {
     this._log =
       typeof process !== "undefined" &&
@@ -58,7 +59,7 @@ export class UpdateManager<T = void> {
         return await this.#update(Array.from(updates.values()), arg);
       },
       () => (this.#isStarted ? "ready" : "pending"),
-      this.getAdaptiveDebounceDelay,
+      getDelayCandidates ?? this.getAdaptiveDebounceDelay,
       this._log,
     );
   }