release-22.2: server/status: silence missing CPU cgroup error

[nvanbenschoten]

Backport 1/1 commits from #118657.

/cc @cockroachdb/release

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Fixes #111648.

This commit eliminates log spam when a CPU cgroup is not configured for the cockroach process. This is a supported deployment mode, but since v22.2.11/v23.1.3/v23.2.0 (df55958), we've been spamming the logs with "unable to get CPU capacity" errors every 10 seconds when running outside of a CPU cgroup.

I considered reducing the severity of the log message from ERROR to INFO, but even that seemed loud for a log message every 10s in a supported deployment mode. For now, we remove the log message.

Release note (bug fix): Cockroach will no longer spam the logs with "unable to get CPU capacity" errors every 10 seconds when running outside of a CPU cgroup.

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Release justification: removes spammy log message.

[blathers-crl]

Thanks for opening a backport.

Please check the backport criteria before merging:

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  issues or test-only changes.
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[blathers-crl]

It looks like your PR touches production code but doesn't add or edit any test code. Did you consider adding tests to your PR?

_{🦉 Hoot! I am a Blathers, a bot for CockroachDB. My owner is dev-inf.}

[cockroach-teamcity]

This change is