[#6392] fix(test): SparkJdbcMysqlCatalogIT33 failed in some enviroment (#6568)

### What changes were proposed in this pull request?

I'm not sure the root reason, seems MYSQL JDBC driver was not loaded
automatically in some condition, in this PR, load Mysql driver
explicitly.

### Why are the changes needed?

Fix: #6392 

### Does this PR introduce _any_ user-facing change?
no

### How was this patch tested?
test in local machine.

Co-authored-by: FANNG <xiaojing@datastrato.com>
Co-authored-by: Qi Yu <yuqi@datastrato.com>

Author: 3 people

integration-test-common/src/test/java/org/apache/gravitino/integration/test/container/MySQLContainer.java

@@ -119,6 +119,14 @@ public void createDatabase(TestDatabaseName testDatabaseName) {
         StringUtils.substring(
             getJdbcUrl(testDatabaseName), 0, getJdbcUrl(testDatabaseName).lastIndexOf("/"));
 
+    // Fix https://github.com/apache/gravitino/issues/6392, MYSQL JDBC driver may not load
+    // automatically.
+    try {
+      Class.forName("com.mysql.jdbc.Driver");
+    } catch (Exception e) {
+      throw new RuntimeException("Failed to load MySQL JDBC driver", e);
+    }
+
     // change password for root user, Gravitino API must set password in catalog properties
     try (Connection connection =
             DriverManager.getConnection(mySQLJdbcUrl, USER_NAME, getPassword());