Adds comprehensive tests for mixed column/row-major interface blocks,
which flush out various bugs in different OpenGL drivers too.

Bug: angleproject:3443
Change-Id: Ie88cca743373891bbb49d9f564f30407475e07fb
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1749334Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>