build: fix invalid umd globals for rxjs operators (#8572)

Previously in `RxJS`, operators were part of the `Rx.Observable` namespace, but now since those will be imported separately from the `rxjs/operators` path, the UMD module name mapping needs to be updated to `Rx.operators` (https://unpkg.com/rxjs@5.5.2/bundles/Rx.js)

Fixes #8530

Author: devversion

package-lock.json

@@ -71,19 +71,19 @@ export const rollupGlobals = {
   'rxjs/observable/fromEventPattern': 'Rx.Observable',
   'rxjs/observable/empty': 'Rx.Observable',
 
-  'rxjs/operators/debounceTime': 'Rx.Observable',
-  'rxjs/operators/takeUntil': 'Rx.Observable',
-  'rxjs/operators/first': 'Rx.Observable',
-  'rxjs/operators/take': 'Rx.Observable',
-  'rxjs/operators/filter': 'Rx.Observable',
-  'rxjs/operators/map': 'Rx.Observable',
-  'rxjs/operators/tap': 'Rx.Observable',
-  'rxjs/operators/startWith': 'Rx.Observable',
-  'rxjs/operators/auditTime': 'Rx.Observable',
-  'rxjs/operators/switchMap': 'Rx.Observable',
-  'rxjs/operators/finalize': 'Rx.Observable',
-  'rxjs/operators/catchError': 'Rx.Observable',
-  'rxjs/operators/share': 'Rx.Observable',
-  'rxjs/operators/delay': 'Rx.Observable',
-  'rxjs/operators/combineLatest': 'Rx.Observable',
+  'rxjs/operators/debounceTime': 'Rx.operators',
+  'rxjs/operators/takeUntil': 'Rx.operators',
+  'rxjs/operators/take': 'Rx.operators',
+  'rxjs/operators/first': 'Rx.operators',
+  'rxjs/operators/filter': 'Rx.operators',
+  'rxjs/operators/map': 'Rx.operators',
+  'rxjs/operators/tap': 'Rx.operators',
+  'rxjs/operators/startWith': 'Rx.operators',
+  'rxjs/operators/auditTime': 'Rx.operators',
+  'rxjs/operators/switchMap': 'Rx.operators',
+  'rxjs/operators/finalize': 'Rx.operators',
+  'rxjs/operators/catchError': 'Rx.operators',
+  'rxjs/operators/share': 'Rx.operators',
+  'rxjs/operators/delay': 'Rx.operators',
+  'rxjs/operators/combineLatest': 'Rx.operators',
 };