Keeps the test lists and version of dEQP in sync.
Also helps reproducibility by removing another set of external environment flags.

Bug: b/140172528
Change-Id: Ib595a1c0c69ffedbfa7848ce8a31c3927bd78980
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/37448
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Reviewed-by: Alexis Hétu <sugoi@google.com>
Reviewed-by: Antonio Maiorano <amaiorano@google.com>
Tested-by: Ben Clayton <bclayton@google.com>