Use a pattern to exclude all compressed and uncompressed test files
instead of relying on them being manually entered.

Bug: None
Change-Id: I76a3117ebeb22f25c46059e84457afffa5ef6757
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2251319Reviewed-by: Manh Nguyen <nguyenmh@google.com>
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>