[WIP] fix: ensure all interop operators are chained correctly

[cartant]

WIP:

#5333 is likely a better solution to the problem.

---

Description:

This PR refactors the fix in #5239 so that it can be applied to all operators - or at least to those that need unsubscription to be chained.

The problem is outlined in the linked issue, but AFAICT the problem is not specific to the finalize operator. For example, the buffer operator's subscriber adds a subscription that depends upon unsubscription being chained correctly:

rxjs/src/internal/operators/buffer.ts

Lines 73 to 76 in 56e7ceb

	constructor(destination: Subscriber<T[]>, closingNotifier: Observable<any>) {
	super(destination);
	this.add(subscribeToResult(this, closingNotifier));
	}

And windowTime adds scheduled actions:

rxjs/src/internal/operators/windowTime.ts

Lines 189 to 206 in 56e7ceb

	constructor(protected destination: Subscriber<Observable<T>>,
	private windowTimeSpan: number,
	private windowCreationInterval: number | null,
	private maxWindowSize: number,
	private scheduler: SchedulerLike) {
	super(destination);
	const window = this.openWindow();
	if (windowCreationInterval !== null && windowCreationInterval >= 0) {
	const closeState: CloseState<T> = { subscriber: this, window, context: <any>null };
	const creationState: CreationState<T> = { windowTimeSpan, windowCreationInterval, subscriber: this, scheduler };
	this.add(scheduler.schedule<CloseState<T>>(dispatchWindowClose, windowTimeSpan, closeState));
	this.add(scheduler.schedule<CreationState<T>>(dispatchWindowCreation, windowCreationInterval, creationState));
	} else {
	const timeSpanOnlyState: TimeSpanOnlyState<T> = { subscriber: this, window, windowTimeSpan };
	this.add(scheduler.schedule<TimeSpanOnlyState<T>>(dispatchWindowTimeSpanOnly, windowTimeSpan, timeSpanOnlyState));
	}
	}

IMO, all operator subscriptions made within an operator's call method should be made using subscribeAndChainOperator.

ATM, this PR's branch is based on #5239, so it includes that PR's commits. The last two commits are the changes introduced in this PR.

Related issue (if exists): #5239

[cartant]

Closed by #5333