fix(connection): pg connection initialization regression (#7986)

In case the initial query contains multiple statements in the postgres connection manager, the result will be an array which is not being handled here. Since we are only interested in the rows from the very last statement, we can skip the rest.

Closes #7985

lib/dialects/postgres/connection-manager.js

@@ -153,7 +153,9 @@ class ConnectionManager extends AbstractConnectionManager {
         query += 'SELECT typname, oid, typarray FROM pg_type WHERE typtype = \'b\' AND typname IN (\'hstore\', \'geometry\', \'geography\')';
       }
 
-      return new Promise((resolve, reject) => connection.query(query, (error, result) => error ? reject(error) : resolve(result))).then(result => {
+      return new Promise((resolve, reject) => connection.query(query, (error, result) => error ? reject(error) : resolve(result))).then(results => {
+        const result = Array.isArray(results) ? results.pop() : results;
+        
         for (const row of result.rows) {
           let type;
           if (row.typname === 'geometry') {