fix(schema-compiler): set missed CUBESQL_SQL_PUSH_DOWN to true by default in convertTzForRawTimeDimension flag (#8939)

Author: KSDaemon

packages/cubejs-backend-shared/src/env.ts

@@ -1750,7 +1750,7 @@ const variables: Record<string, (...args: any) => any> = {
   maxSourceRowLimit: () => get('CUBEJS_MAX_SOURCE_ROW_LIMIT')
     .default(200000)
     .asInt(),
-  convertTzForRawTimeDimension: () => get('CUBESQL_SQL_PUSH_DOWN').default('false').asBoolStrict(),
+  convertTzForRawTimeDimension: () => get('CUBESQL_SQL_PUSH_DOWN').default('true').asBoolStrict(),
   // Deprecated section
 
   // Support for Redis as queue & cache driver was removed in 0.36