GLSLTest_ES3 end2end tests are enabled for Vulkan, though with
suppressions for other features that are missing.

Bug: angleproject:3199
Change-Id: Ie744e160eab2df9a5a4f2c67ea5acf4b865ea5bf
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1565058
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>