SBasePoseViewport should use ExtendedBounds, not ImportedBounds

In accordance with CL-9139422 of [Link Removed], the SkeletalMesh ImportedBounds does not have an Extend operation. However, SBasePoseViewport, the UI for retagettes, continues to use ImportedBounds. So, the display is not correct.

To solve this problem, you can use SBasePoseViewport:: SetSkeleton needs to fix the following code.

Current:

NewPosition *= (PreviewSkeletalMesh->GetImportedBounds().SphereRadius*1.5f);

Proposal:

PreviewSkeletalMesh->CalculateExtendedBounds(); // Unnecessary?
NewPosition *= (PreviewSkeletalMesh->GetBounds().SphereRadius*1.5f);

1. Import the attached fbx(SK_Mannequin_test.fbx)
2. Prepare for retargeting, including setting up Humanrig
3. Trying to retarget the animation sequence of SK_Manqeuin

Result:
The preview of SK_Mannequin_test in the UI for Retarget is not correct