fix(runtime): remove forceUpdate in appendChild patch (#5437)

This commit removes a call to `forceUpdate` that was added to Stencil's patch for `appendChild` for slot emulation. The call was originally added to fix a failing test in Framework that we've now identified was the result of the patch's DOM manipulation in tandem with a mutation observer in framework.

Instead, the mutation observer in framework was modified to observe changes in the element subtree, removing the need for this call.

STENCIL-1192

Author: tanner-reits

src/runtime/dom-extras.ts

@@ -1,5 +1,5 @@
 import { BUILD } from '@app-data';
-import { forceUpdate, getHostRef, plt, supportsShadow } from '@platform';
+import { getHostRef, plt, supportsShadow } from '@platform';
 import { NODE_TYPES } from '@stencil/core/mock-doc';
 import { CMP_FLAGS, HOST_FLAGS } from '@utils';
 
@@ -88,8 +88,6 @@ export const patchSlotAppendChild = (HostElementPrototype: any) => {
 
       // Check if there is fallback content that should be hidden
       updateFallbackSlotVisibility(this);
-      // Force a re-render of the host element
-      forceUpdate(this);
 
       return insertedNode;
     }

src/runtime/vdom/vdom-render.ts

@@ -1041,7 +1041,7 @@ render() {
           // If the node we're currently planning on inserting the new node before is an element,
           // we need to do some additional checks to make sure we're inserting the node in the correct order.
           // The use case here would be that we have multiple nodes being relocated to the same slot. So, we want
-          // to make sure they get inserted into their new how in the same order they were declared in their original location.
+          // to make sure they get inserted into their new home in the same order they were declared in their original location.
           //
           // TODO(STENCIL-914): Remove `experimentalSlotFixes` check
           if (