24.3 backport of #66237 - Fix detection of number of CPUs in containers

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Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix detection of number of CPUs in containers. In the case when the 'root' cgroup was used (i.e. name of cgroup was empty, which is common for containers) ClickHouse was ignoring the CPU limits set for the container. (ClickHouse#66237 by @filimonov)

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Check name	Description	Status
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Check name	Description	Status
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