i915/gem_userptr_blits: Reduce readonly test runtime

We do a lot of randomised passes to look for the same mistake. If the
first worked, the likelihood of any of the later attempts failing is
miniscule. Instead, lets use the repeated passed over many CI_DRM to do
the thorough testing.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
26 jobs for master in 9 minutes and 42 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Containers
passed #3567278
build-containers:build-debian

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build-containers:build-debian-arm64

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build-containers:build-debian-armhf

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build-containers:build-debian-mips

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build-containers:build-fedora

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  Build
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build:tests-debian-autotools

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build:tests-debian-meson

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build:tests-debian-meson-arm64

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passed #3567289
build:tests-debian-meson-armhf

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passed #3567291
build:tests-debian-meson-mips

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passed #3567288
build:tests-debian-minimal

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passed #3567283
build:tests-fedora

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build:tests-fedora-clang

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build:tests-fedora-no-libunwind

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build:tests-fedora-oldest-meson

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  Test
passed #3567300
test:list-undocumented-tests

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test:ninja-test

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test:ninja-test-arm64

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test:ninja-test-armhf

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passed #3567294
test:ninja-test-clang

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passed #3567295
test:ninja-test-minimal

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passed #3567298
test:ninja-test-mips

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test:test-list-diff

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passed #3567301
test:verify-blacklists

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  Containers
passed #3567302
containers:igt

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  Deploy
manual #3567303
allowed to fail manual
pages