ci/windows: Bump the number of tests per group

Due to the slow startup time of deqp-vk, the previous default of
500 tests per group caused the jobs to run up to twice as slowly
compared to using a higher number of tests per group.

Increase the number of tests per group in the deqp-runner suite,
which allows decreasing the fraction.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/32704>

src/microsoft/ci/deqp-dozen.toml

@@ -11,3 +11,4 @@ caselists = ["/deqp/mustpass/vk-main.txt"]
 skips = ["./_install/warp-skips.txt"]
 flakes = ["./_install/warp-flakes.txt"]
 renderer_check = 'Microsoft Direct3D12 \(Microsoft Basic Render Driver\)'
+tests_per_group = 5000

src/microsoft/ci/gitlab-ci.yml

@@ -37,7 +37,7 @@ test-dozen-deqp:
     GIT_STRATEGY: none # testing doesn't build anything from source
     DZN_AGILITY_RELATIVE_PATH: "D3D12\\"
     DZN_AGILITY_SDK_VERSION: 614
-    DEQP_FRACTION: 8
+    DEQP_FRACTION: 4
   script:
     - . _install/deqp_runner_run.ps1
   artifacts: