[devops] workaround Chromium windows issues with swiftshader

[aslushnikov]

Upstream bugs:

• https://bugs.chromium.org/p/chromium/issues/detail?id=1198567
• https://bugs.chromium.org/p/chromium/issues/detail?id=1200964

Once upstream issues are all fixed, we can revert this step in our build procedure.
For now, we should fix the vk_swiftshader_icd.json to be correct on windows in
our builder.

[aslushnikov]

This is now reverted and passes on Windows.