[v0.8 backport] frontend: fix testMultiStageImplicitFrom to account for busybox changes#3439

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thaJeztah wants to merge 4 commits intomoby:v0.8from

thaJeztah:0.8_backport_fix_tests2

Commits on Dec 27, 2022

integration: fix TestSecurityModeSysfs on cgroup v2

AkihiroSuda
authored and
thaJeztah
committed
frontend: fix testMultiStageImplicitFrom to account for busybox changes
thaJeztah
committed

Commits on Jan 3, 2023

integration: add ENTRYPOINT to fix nested cgroup v2

AkihiroSuda
authored and
crazy-max
committed
[0.8] integration: skip TestSecurityModeSysfs (insecure mode)
crazy-max
committed