AC-9755:Set default collation to utf8mb4 for MySQL

Author: glo17680

setup/src/Magento/Setup/Model/Installer.php

@@ -667,7 +667,7 @@ private function setupModuleRegistry(SchemaSetupInterface $setup)
                 $columns = ['module' => ['varchar(50)',''],
                             'schema_version' => ['varchar(50)',''],
                             'data_version' => ['varchar(50)','']];
-                $this->updateDBTable($tableName, $columns, $connection);
+                $this->setColumnCollationAndCharset($tableName, $columns, $connection);
             }
         }
     }
@@ -734,7 +734,7 @@ private function setupSessionTable(
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $tableName = $setup->getTable('session');
                 $columns = ['session_id' => ['varchar(255)','']];
-                $this->updateDBTable($tableName, $columns, $connection);
+                $this->setColumnCollationAndCharset($tableName, $columns, $connection);
             }
         }
     }
@@ -797,7 +797,7 @@ private function setupCacheTable(
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $tableName = $setup->getTable('cache');
                 $columns = ['id' => ['varchar(200)','']];
-                $this->updateDBTable($tableName, $columns, $connection);
+                $this->setColumnCollationAndCharset($tableName, $columns, $connection);
             }
         }
     }
@@ -842,7 +842,7 @@ private function setupCacheTagTable(
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $tableName = $setup->getTable('cache_tag');
                 $columns = ['tag' => ['varchar(100)',''],'cache_id' => ['varchar(200)','']];
-                $this->updateDBTable($tableName, $columns, $connection);
+                $this->setColumnCollationAndCharset($tableName, $columns, $connection);
             }
         }
     }
@@ -906,7 +906,7 @@ private function setupFlagTable(
             $getTableSchema = $connection->getCreateTable($tableName) ?? '';
             if (preg_match('/\b('. self::OLDCHARSET .')\b/', $getTableSchema)) {
                 $columns = ['flag_code' => ['varchar(255)','NOT NULL'],'flag_data' => ['mediumtext','']];
-                $this->updateDBTable($tableName, $columns, $connection);
+                $this->setColumnCollationAndCharset($tableName, $columns, $connection);
             }
         }
     }
@@ -1891,7 +1891,7 @@ private function reindexAll(): void
      * @param AdapterInterface $connection
      * @return void
      */
-    private function updateDBTable(string $tableName, array $columns, $connection) : void
+    private function setColumnCollationAndCharset(string $tableName, array $columns, $connection) : void
     {
         $charset = $this->columnConfig->getDefaultCharset();
         $collate = $this->columnConfig->getDefaultCollation();