Exports the latest test data to a Google Sheets document.

Change-Id: Ia1b38464daf7117da571d536e7ff029023b9de58
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/26748Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>