build: flatten esm5 sources before rollup (#23131)

this is needed to update to latest rules_nodejs due to breaking change in
https://github.com/bazelbuild/rules_nodejs/pull/172
It has the side-effect of correctly marking rxjs packages as side-effect-free

PR Close #23131

packages/core/test/bundling/todo/bundle.golden_symbols.json

@@ -17,27 +17,12 @@
   {
     "name": "CommonModule"
   },
-  {
-    "name": "ConnectableSubscriber"
-  },
-  {
-    "name": "Context"
-  },
-  {
-    "name": "CountedSubject"
-  },
   {
     "name": "DefaultIterableDiffer"
   },
   {
     "name": "DefaultIterableDifferFactory"
   },
-  {
-    "name": "DelayMessage"
-  },
-  {
-    "name": "EMPTY$1"
-  },
   {
     "name": "EMPTY$2"
   },
@@ -53,21 +38,12 @@
   {
     "name": "EmbeddedViewRef$1"
   },
-  {
-    "name": "EmptyError"
-  },
   {
     "name": "EventEmitter"
   },
   {
     "name": "GET_PROPERTY_NAME$1"
   },
-  {
-    "name": "GroupDurationSubscriber"
-  },
-  {
-    "name": "GroupedObservable"
-  },
   {
     "name": "INJECTOR"
   },
@@ -77,12 +53,6 @@
   {
     "name": "InjectionToken"
   },
-  {
-    "name": "InnerRefCountSubscription"
-  },
-  {
-    "name": "InnerSubscriber"
-  },
   {
     "name": "IterableChangeRecord_"
   },
@@ -92,9 +62,6 @@
   {
     "name": "NG_PROJECT_AS_ATTR_NAME"
   },
-  {
-    "name": "NONE"
-  },
   {
     "name": "NOT_YET"
   },
@@ -113,9 +80,6 @@
   {
     "name": "NgOnChangesFeature"
   },
-  {
-    "name": "Notification"
-  },
   {
     "name": "NullInjector"
   },
@@ -125,27 +89,15 @@
   {
     "name": "Observable"
   },
-  {
-    "name": "ObserveOnMessage"
-  },
-  {
-    "name": "ObserveOnSubscriber"
-  },
   {
     "name": "Optional"
   },
-  {
-    "name": "OuterSubscriber"
-  },
   {
     "name": "PARAMETERS"
   },
   {
     "name": "PRIVATE_PREFIX"
   },
-  {
-    "name": "QueueAction"
-  },
   {
     "name": "R3Injector"
   },
@@ -155,36 +107,18 @@
   {
     "name": "RecordViewTuple"
   },
-  {
-    "name": "RefCountOperator$1"
-  },
-  {
-    "name": "RefCountSubscriber$1"
-  },
-  {
-    "name": "ReplayEvent"
-  },
   {
     "name": "SafeSubscriber"
   },
   {
     "name": "Self"
   },
-  {
-    "name": "SequenceEqualCompareToSubscriber"
-  },
   {
     "name": "SimpleChange"
   },
   {
     "name": "SkipSelf"
   },
-  {
-    "name": "StaticArrayIterator"
-  },
-  {
-    "name": "StaticIterator"
-  },
   {
     "name": "Subject"
   },
@@ -200,9 +134,6 @@
   {
     "name": "Subscription"
   },
-  {
-    "name": "SubscriptionDelaySubscriber"
-  },
   {
     "name": "THROW_IF_NOT_FOUND"
   },
@@ -230,9 +161,6 @@
   {
     "name": "ViewContainerRef$1"
   },
-  {
-    "name": "ZipBufferIterator"
-  },
   {
     "name": "_CLEAN_PROMISE"
   },
@@ -251,6 +179,21 @@
   {
     "name": "__extends"
   },
+  {
+    "name": "__extends$1"
+  },
+  {
+    "name": "__extends$2"
+  },
+  {
+    "name": "__extends$4"
+  },
+  {
+    "name": "__extends$5"
+  },
+  {
+    "name": "__extends$6"
+  },
   {
     "name": "__global"
   },
@@ -410,36 +353,6 @@
   {
     "name": "directiveCreate"
   },
-  {
-    "name": "dispatch"
-  },
-  {
-    "name": "dispatchBufferClose"
-  },
-  {
-    "name": "dispatchBufferCreation"
-  },
-  {
-    "name": "dispatchBufferTimeSpanOnly"
-  },
-  {
-    "name": "dispatchNext$2"
-  },
-  {
-    "name": "dispatchNext$3"
-  },
-  {
-    "name": "dispatchNotification"
-  },
-  {
-    "name": "dispatchWindowClose"
-  },
-  {
-    "name": "dispatchWindowCreation"
-  },
-  {
-    "name": "dispatchWindowTimeSpanOnly"
-  },
   {
     "name": "domRendererFactory3"
   },
@@ -458,12 +371,6 @@
   {
     "name": "empty"
   },
-  {
-    "name": "empty$1"
-  },
-  {
-    "name": "emptyScheduled"
-  },
   {
     "name": "enterView"
   },
@@ -512,9 +419,6 @@
   {
     "name": "forwardRef"
   },
-  {
-    "name": "fromArray"
-  },
   {
     "name": "generateInitialInputs"
   },
@@ -575,9 +479,6 @@
   {
     "name": "getSymbolIterator"
   },
-  {
-    "name": "getSymbolIterator$1"
-  },
   {
     "name": "getTypeNameForDebugging"
   },
@@ -635,9 +536,6 @@
   {
     "name": "isArray"
   },
-  {
-    "name": "isArrayLike"
-  },
   {
     "name": "isCssClassMatching"
   },
@@ -677,12 +575,6 @@
   {
     "name": "isProceduralRenderer"
   },
-  {
-    "name": "isPromise"
-  },
-  {
-    "name": "isScheduler"
-  },
   {
     "name": "isTrustedSubscriber"
   },
@@ -695,9 +587,6 @@
   {
     "name": "iterateListLike"
   },
-  {
-    "name": "iterator"
-  },
   {
     "name": "leaveView"
   },
@@ -737,18 +626,12 @@
   {
     "name": "observable"
   },
-  {
-    "name": "of"
-  },
   {
     "name": "pipeFromArray"
   },
   {
     "name": "providerToRecord"
   },
-  {
-    "name": "queue"
-  },
   {
     "name": "queueComponentIndexForCheck"
   },
@@ -770,9 +653,6 @@
   {
     "name": "queueViewHooks"
   },
-  {
-    "name": "refCount"
-  },
   {
     "name": "refreshChildComponents"
   },
@@ -815,9 +695,6 @@
   {
     "name": "saveResolvedLocalsInData"
   },
-  {
-    "name": "scalar"
-  },
   {
     "name": "scheduleTick"
   },
@@ -845,33 +722,12 @@
   {
     "name": "stringify$1"
   },
-  {
-    "name": "subscribeTo"
-  },
-  {
-    "name": "subscribeToArray"
-  },
-  {
-    "name": "subscribeToIterable"
-  },
-  {
-    "name": "subscribeToObservable"
-  },
-  {
-    "name": "subscribeToPromise"
-  },
-  {
-    "name": "subscribeToResult"
-  },
   {
     "name": "text"
   },
   {
     "name": "textBinding"
   },
-  {
-    "name": "throwError"
-  },
   {
     "name": "throwErrorIfNoChangesMode"
   },