ReactiveX / rxjs / 7250

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fix(Subscriber): Can no longer subscribe to itself in a circular manner (#4106)

* test(mergeMap): add failing test

* fix(subscriber): don't unsubscribe self

When unsubscribing a subscriber's parent, make sure that the subscriber
itself is not unsubscribed.

Closes #4095

* refactor(mergeMap): simplify

* chore(typings): use union type for destination

* chore(test): remove only

* chore(test): use pipe

* test(Subscriber): fake add too

* test(internals): update for subscription changes

* refactor(zip): add to destination

* refactor(delay): add to destination

* refactor(delayWhen): add to destination

* refactor(exhaustMap): add to destination

* refactor(expand): add to destination

* refactor(mergeScan): add to destination

* refactor(observeOn): add to destination

* refactor(onErrorResumeNext): add to destination

* refactor(sequenceEqual): add to destination

* refactor(switchMap): add to destination

* chore(Subscriber): remove _addParentTeardownLogic

* chore(test): simplify mergeMap test

Remove the mapTo and the concat to reduce the number of subscribers to
make the test easier to reason with.

1807 of 2177 branches covered (83.0%)

5789 of 5970 relevant lines covered (96.97%)

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