Temporarily disable FP16 float uniform transform feature Some webgl_conformance_vulkan_passthrough_tests are failing with the shaders generating 16-bit for lower precision uniforms. Temporarily disable the feature while investigating the root cause. Bug: chromium:443182226 Bug: chromium:443182234 Bug: angleproject:405795981 Change-Id: I62850f5dc979912a0605edb1aea5b74774b4421d Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6918101 Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Commit-Queue: Yuxin Hu <yuxinhu@google.com>