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Reapply "tests: disable flaky check on X11" #2510

Job	Run time
translations / pot	25s
build / lint	1m 4s
build / build (pack, -Desm=true)	50s
build / build (pack-legacy, -Desm=false)	52s
test / configure	2s
packaging / archlinux	2m 15s
packaging / archlinux-nocheck	1m 23s
test / test (alpine-3.18, legacy)	4m 15s
test / test (alpine-3.19, esm)	3m 58s
test / test (alpine-3.20, esm)	3m 48s
test / test (alpine-3.21, esm)	3m 56s
test / test (fedora-40, esm)	3m 37s
test / test (fedora-41, esm)	3m 30s
test / test (opensuse-tumbleweed, esm)	3m 26s
test / test (debian-12, legacy)	4m 5s
test / test (ubuntu-22.04, legacy)	4m 23s
test / test (ubuntu-24.04, esm)	3m 56s
test / test (ubuntu-24.10, esm)	5m 18s
test / test (opensuse-leap-15.6, esm)	3m 25s
packaging / archlinux-test-installed	3m 29s
	57m 57s

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