It was removed in [1] as part of cgroupsv2 cleanup.
However, the testing did not catch the fact that the legacy
cgroups behaviour was actually still breaking despite latest
Docker and setting to use host's cgroups namespace.

[1] 286a03ba

Closes-Bug: #1941706
Change-Id: I629bb9e70a3fd6bd1e26b2ca22ffcff5e9e8c731