Cherry-pick: Unblock ttl part drops for cold volumes#1797
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…merges_in_cold_volumes Unblock ttl part drops for cold volumes
The 25.3 backport 8044e6a of upstream PR ClickHouse#94363 added test_size_limit_metric.py and filesystem_caches.xml but missed the filesystem_caches_path.xml config the test references, leaving the test broken with FileNotFoundError during cluster setup. Restore the file from upstream commit cc19d95 ("Fix test"). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Cherry-picked from ClickHouse#90059.
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Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):
Split part ranges by volume characteristics to enable TTL drop merges for cold volumes. After this patch, parts with a max TTL < now will be removed from cold storage. The algorithm will schedule only single part drops (ClickHouse#90059 by @Michicosun)
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