[KIKIMR-22131] Hot-fix for production: Y_ENSURE → Y_ASSERT (ydb-platform#11130)

Author: abyss7

ydb/library/yql/minikql/computation/mkql_computation_pattern_cache.cpp

@@ -77,7 +77,7 @@ class TComputationPatternLRUCache::TLRUPatternCacheImpl
 
         const auto& entry = it->second.Entry;
 
-        Y_ENSURE(entry->Pattern->IsCompiled());
+        Y_ASSERT(entry->Pattern->IsCompiled());
 
         if (it->second.LinkedInCompiledPatternLRUList()) {
             return;