Remove unsupported image load store tests

Remove unsupported image load store tests

CL https://gerrit.khronos.org/#/c/2639/ added more
formats to the dEQP-VK.image.mutable.* tests. Variants
of these tests use image load store. However, the new
formats added are not all compatible with image load
store as defined by:
https://www.khronos.org/registry/vulkan/specs/1.1/html/vkspec.html#spirvenv-image-formats

This CL removes test variants that use image load store
and the invalid formats from the mustpass list.

Affected tests:
dEQP-VK.image.mutable.*
dEQP-VK.image.swapchain_mutable.*

Components: Vulkan

VK-GL-CTS issue: 1495

Change-Id: I49867913ba5c4e50b4f3d85d7c6787dc60113e63