Various features already implemented hadn't removed suppressions for
GLES 3.1.

Bug: angleproject:3205
Bug: angleproject:3208
Bug: angleproject:3561
Bug: angleproject:3604
Change-Id: I1cfc5d2150fae6b138fa21a37f8e95cb7d764770
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1771989
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Ian Elliott <ianelliott@google.com>