Replace port_to_expose with port as testcontainers upgrade

[shunping]

A few tests are failing (https://github.com/apache/beam/actions/runs/15985918137) due to testcontainers upgrade in (#35216).

It seems that after 4.x, testcontainers deprecated port_to_expose (testcontainers/testcontainers-python#296).

This PR attempts to forward fix this by replacing port_to_expose with port in our tests.

[claudevdm]

I dont think this test suite is necessary, it runs on dataflow.

[shunping]

Getting the following error:

E       ModuleNotFoundError: No module named 'MySQLdb'

../../build/gradleenv/1398941893/lib/python3.9/site-packages/sqlalchemy/dialects/mysql/mysqldb.py:149: ModuleNotFoundError

After searching on the web, it seems we will need to install mysqlclient.

[shunping]

I am trying to find out the root cause of why we need MySQLdb after testcontainers upgrade.

I followed the failed test code(

beam/sdks/python/apache_beam/io/external/xlang_jdbcio_it_test.py

Lines 123 to 140 in 623e998

	'mysql': DbData(
	lambda: MySqlContainer(), ['mysql:mysql-connector-java:8.0.28'],
	'mysql',
	'com.mysql.cj.jdbc.Driver')
	}
	@classmethod
	def setUpClass(cls):
	cls.containers = {}
	cls.engines = {}
	cls.jdbc_configs = {}
	for db_type, db_data in cls.DB_CONTAINER_CLASSPATH_STRING.items():
	container = cls.start_container(db_data.container_fn)
	cls.containers[db_type] = container
	cls.engines[db_type] = sqlalchemy.create_engine(
	container.get_connection_url())

), extracted the following code block and ran it on version 3.7.1 and 4.10.0.

from testcontainers.mysql import MySqlContainer
container = MySqlContainer()
container.start()
print(container.get_connection_url())

Connection url from version 3.7.1

mysql+pymysql://test:test@localhost:32768/test

Connection url from version 4.10.0

mysql://test:test@localhost:32770/test

In version 3.7.1, it uses pymysql driver:
https://github.com/testcontainers/testcontainers-python/blob/28e3a471c32c1036dd5e37df13cdde3b1ba91000/testcontainers/mysql.py#L67

In version 4.10.0, if we do not specify dialect, it will not contain a driver in the url.

When we call sqlalchemy.create_engine(), the two urls are routed to different code paths

[shunping]

By adding dialect when initializing MySqlContainer, i.e. container = MySqlContainer(dialect='pymysql'), I am able to get the same connection url in 4.10.0 as 3.7.1.

[shunping]

Looks like the previous failed test is green now.
https://github.com/apache/beam/actions/runs/16014666896/job/45178934425?pr=35501

[shunping]

cc'ed @Amar3tto @damccorm

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[damccorm]

LGTM