Remove Test-Win10-Clang-RUBYR5-GPU-RadeonVega6-x86_64-Debug-All-Direct3D also.

Both the Debug and Release version of this job are timing out at over 4 hours.

Bug: b/334917091
Change-Id: Ic82aabfab77f30f56fadf9c243b9e364a458d57e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/841336
Auto-Submit: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>