Revert "fix(animations): always fire inner trigger callbacks even if blocked by parent animations (#19753)"

This reverts commit 5a9ed2de27.
As it broke an internal test.

packages/animations/src/players/animation_group_player.ts

@@ -140,11 +140,4 @@ export class AnimationGroupPlayer implements AnimationPlayer {
       }
     });
   }
-
-  /* @internal */
-  triggerCallback(phaseName: string): void {
-    const methods = phaseName == 'start' ? this._onStartFns : this._onDoneFns;
-    methods.forEach(fn => fn());
-    methods.length = 0;
-  }
 }

packages/animations/src/players/animation_player.ts

@@ -31,8 +31,6 @@ export interface AnimationPlayer {
   parentPlayer: AnimationPlayer|null;
   readonly totalTime: number;
   beforeDestroy?: () => any;
-  /* @internal */
-  triggerCallback?: (phaseName: string) => void;
 }
 
 /**
@@ -93,11 +91,4 @@ export class NoopAnimationPlayer implements AnimationPlayer {
   reset(): void {}
   setPosition(p: number): void {}
   getPosition(): number { return 0; }
-
-  /* @internal */
-  triggerCallback(phaseName: string): void {
-    const methods = phaseName == 'start' ? this._onStartFns : this._onDoneFns;
-    methods.forEach(fn => fn());
-    methods.length = 0;
-  }
-}
+}