turnip/ci: Reduce parallelism of a660-vk

Some `sm8350-hdk` DUTs are currently failing LAVA health checks in the
Collabora farm, reducing available capacity. To mitigate job delays,
temporarily reduce the parallelism of the `a660-vk` job.

Thanks to previous optimizations and further increasing the
tests_per_group setting, there is no loss in test coverage.

Signed-off-by: Valentine Burley <valentine.burley@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35939>

src/freedreno/ci/deqp-freedreno-a660-vk-full.toml

@@ -5,7 +5,7 @@ caselists = ["/deqp-vk/mustpass/vk-main.txt"]
 skips = ["install/freedreno-a6xx-skips.txt"]
 timeout = 300
 renderer_check = "Turnip Adreno .* 660"
-tests_per_group = 5000
+tests_per_group = 10000
 
 # force-gmem testing
 # Autotuner forces sysmem on most CTS tests

src/freedreno/ci/deqp-freedreno-a660-vk.toml

@@ -4,7 +4,7 @@ deqp = "/deqp-vk/external/vulkancts/modules/vulkan/deqp-vk"
 caselists = ["/deqp-vk/mustpass/vk-main.txt"]
 skips = ["install/freedreno-a6xx-skips.txt"]
 renderer_check = "Turnip Adreno .* 660"
-tests_per_group = 5000
+tests_per_group = 10000
 
 # force-gmem testing
 # Autotuner forces sysmem on most CTS tests

src/freedreno/ci/gitlab-ci.yml

@@ -249,7 +249,7 @@ a660-vk:
     - .lava-arm64-test-vk
     - .collabora-turnip-rules
     - .lava-sm8350-hdk:arm64
-  parallel: 5
+  parallel: 3
   variables:
     DEQP_SUITE: freedreno-a660-vk
     FLAKES_CHANNEL: "#freedreno-ci"