23.8 Backport of #56030 - Fix incorrect free space accounting for least_used JBOD policy

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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 incorrect free space accounting for least_used JBOD policy (ClickHouse#56030 by @azat)

[altinity-robot]

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