test(operator-concatAll): use run mode (#5144)
test(operator-concatAll): use run mode (#5144)

* test(operator-concatAll): use run mode

* fix(operator-concatAll): whitespace

* fix: using prettier to format + address nits

ReactiveX/RxJS,ReactiveX/rxjs,martinsik/rxjs,trxcllnt/RxJS,ReactiveX/RxJS,benlesh/RxJS,trxcllnt/RxJS,kwonoj/RxJS,ReactiveX/rxjs,ReactiveX/RxJS,kwonoj/RxJS,benlesh/RxJS,trxcllnt/RxJS,martinsik/rxjs,martinsik/rxjs,ReactiveX/RxJS,benlesh/RxJS,ReactiveX/rxjs,benlesh/RxJS,martinsik/rxjs,kwonoj/RxJS,ReactiveX/rxjs,trxcllnt/RxJS,kwonoj/RxJS