fix: scheduling with Rx-provided schedulers will no longer leak action references (#6562)

* fix: scheduling with Rx-provided schedulers will no longer leak action references

Resolves #6561

* refactor: Remove circular dependencies and redundant code

* chore: update api_guardian files

Author: benlesh

api_guard/dist/types/index.d.ts

@@ -251,7 +251,7 @@ export declare function forkJoin<T extends Record<string, ObservableInput<any>>>
 }>;
 
 export declare function from<O extends ObservableInput<any>>(input: O): Observable<ObservedValueOf<O>>;
-export declare function from<O extends ObservableInput<any>>(input: O, scheduler: SchedulerLike): Observable<ObservedValueOf<O>>;
+export declare function from<O extends ObservableInput<any>>(input: O, scheduler: SchedulerLike | undefined): Observable<ObservedValueOf<O>>;
 
 export declare function fromEvent<T>(target: HasEventTargetAddRemove<T> | ArrayLike<HasEventTargetAddRemove<T>>, eventName: string): Observable<T>;
 export declare function fromEvent<T, R>(target: HasEventTargetAddRemove<T> | ArrayLike<HasEventTargetAddRemove<T>>, eventName: string, resultSelector: (event: T) => R): Observable<R>;

src/internal/observable/combineLatest.ts

@@ -10,6 +10,7 @@ import { popResultSelector, popScheduler } from '../util/args';
 import { createObject } from '../util/createObject';
 import { OperatorSubscriber } from '../operators/OperatorSubscriber';
 import { AnyCatcher } from '../AnyCatcher';
+import { executeSchedule } from '../util/executeSchedule';
 
 // combineLatest(any)
 // We put this first because we need to catch cases where the user has supplied
@@ -293,7 +294,7 @@ export function combineLatestInit(
  */
 function maybeSchedule(scheduler: SchedulerLike | undefined, execute: () => void, subscription: Subscription) {
   if (scheduler) {
-    subscription.add(scheduler.schedule(execute));
+    executeSchedule(subscription, scheduler, execute);
   } else {
     execute();
   }