ci: skip glsl-uniform-interstage-limits tests for softpipe jobs

these tests take over 5 minutes just locally, and the codepaths are mostly
shared with llvmpipe in the draw module, so there's not much point in running
them given that other drivers are more likely to catch any issues here over
softpipe, which is only more likely to catch timeouts
46 jobs for !10708 with softpipe-ci in 10 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Sanity
passed #9592252
sanity

00:00:10

 
  Container
manual #9592255
aarch64 manual
arm_build
manual #9592256
windows shell 1809 mesa manual
windows_build_vs2019
manual #9592253
manual
x86_build-base
manual #9592254
manual
x86_test-base
 
  Container 2
created #9592261
android_build
created #9592258
i386_build
created #9592264
kernel+rootfs_amd64
created #9592265
aarch64
kernel+rootfs_arm64
created #9592266
aarch64
kernel+rootfs_armhf
created #9592259
ppc64el_build
created #9592260
s390x_build
created #9592257
x86_build
created #9592262
x86_test-gl
created #9592263
x86_test-vk
 
  Meson X86 64
created #9592272
meson-clang
created #9592273
meson-clover
created #9592269
meson-clover-testing
created #9592270
meson-gallium
created #9592271
meson-release
created #9592267
meson-testing
created #9592268
meson-testing-asan
created #9592274
meson-vulkan
 
  Build Misc
created #9592275
arm_test
created #9592276
meson-android
created #9592278
aarch64
meson-arm64
created #9592279
aarch64
meson-arm64-asan
created #9592280
aarch64
meson-arm64-build-test
created #9592277
aarch64
meson-armhf
created #9592281
meson-i386
created #9592284
meson-mingw32-x86_64
created #9592283
meson-ppc64el
created #9592282
kvm
meson-s390x
 
  Intel
created #9592287
mesa-ci-aarch64-lava-collabora manual
iris-amly-traces:amd64
created #9592285
mesa-ci-aarch64-lava-collabora manual
iris-apl-traces:amd64
created #9592286
mesa-ci-aarch64-lava-collabora manual
iris-glk-traces:amd64
 
  Software Renderer
created #9592295
softpipe-asan-gles31
created #9592297
softpipe-gl
created #9592288
softpipe-gles2
created #9592289
softpipe-gles3
created #9592290
softpipe-gles31 1/2
created #9592291
softpipe-gles31 2/2
created #9592292
softpipe-khr-gles2
created #9592293
softpipe-khr-gles3
created #9592294
softpipe-khr-gles31
created #9592296
softpipe-piglit-quick