[fix](fe) Enable fuzzy for enable_query_cache - #7

Summary

Enable fuzzy for enable_query_cache session variable to match similar pattern with other cache variables.

Problem

The enable_query_cache variable was missing the fuzzy = true attribute, which is inconsistent with other similar cache-related session variables like enableHiveSqlCache.

Solution

Add fuzzy = true to the @VariableMgr.VarAttr annotation for enableQueryCache.

Testing

• Manual testing: Verified the variable can be set with fuzzy matching
• Existing unit tests: N/A (configuration change only)

Release Note

None