remove unused test helper

src/utils/test.ts

@@ -80,7 +80,6 @@ export async function flushPromises(): Promise<void> {
 }
 
 export interface OurRunHelpers extends RunHelpers {
-  scheduler: TestScheduler;
   /**
    * Schedules a sequence of actions to happen, as described by a marble
    * diagram.
@@ -124,7 +123,6 @@ export function withTestScheduler(
     continuation({
       ...helpers,
       scope,
-      scheduler,
       schedule(marbles, actions) {
         const actionsObservable$ = helpers
           .cold(marbles)