This test fails on the Vulkan backend because Vulkan does not allow
arrays of arrays of samplers.

Also adds a few other tests relating to arrays of arrays.

Test: ./angle_end2end_tests --gtest_filter='GLSLTest_ES31.*'
Bug: angleproject:3604
Change-Id: I5c47119b6ba6d26fe30fdd9c6730caac6f222696
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1733476
Commit-Queue: James Dong <dongja@google.com>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>