This cache is based on sqlitedict, which is not very actively maintained upstream.
All UseGalaxy.* servers seem to have enable_tool_document_cache set to False and its only known use was for AnVIL, which dropped it in galaxyproject/galaxy-helm#438 .

Plan:

• Deprecate enable_tool_document_cache and tool_cache_data_dir in the 25.0 release notes and config files [25.0] Deprecate enable_tool_document_cache #20433
• Remove the code implementing this in 25.1