Reconciler: Combine identical cases in findParent (#32210)

## Summary

When lookup `Parent`, `HostRoot` and `HostPortal` should be merged,
because when creating a `Portal`, it will also include
`containerInfo`(So we can directly use this `containerInfo` to delete
the real DOM nodes.), so there is no need to handle them separately.

## How did you test this change?

No behavior changes, all existing tests pass.

packages/react-reconciler/src/ReactFiberCommitWork.js

@@ -2007,11 +2007,7 @@ function commitDeletionEffects(
           hostParentIsContainer = false;
           break findParent;
         }
-        case HostRoot: {
-          hostParent = parent.stateNode.containerInfo;
-          hostParentIsContainer = true;
-          break findParent;
-        }
+        case HostRoot:
         case HostPortal: {
           hostParent = parent.stateNode.containerInfo;
           hostParentIsContainer = true;