This commit introduces an integration test for the status quo in the
Spring TestContext Framework (TCF) for multiple transaction managers
registered as @Primary and via the TransactionManagementConfigurer API.
In Spring Framework 5.3 we will revise the transaction manager lookup in
TestContextTransactionUtils so that the transaction manager configured
via the TransactionManagementConfigurer API is favored over a @Primary
transaction manager.
See gh-24869