Add several angle bugs for end2end tests failing on NVIDIA.

  - TwiceMaxVaryingVec2 failing on GLES
  - MipLevels failing on Shield GLES
  - GenerateMipmapCubeBaseLevel failing on GL

BUG=angleproject:3849
BUG=angleproject:3850
BUG=angleproject:3851

Change-Id: I6e5283f0d4c1c5da8259034dfda3beb94e041b21
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1768016
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>