Previously, a custom FlywayMigrationInitializer bean named anything
other than flywayInitializer could result in a
NoSucBeanDefinitionException as the dependencies set up for JPA and
JDBC components used the bean name flywayInitializer.
This commit updates the configuration of the dependencies to depend
on FlywayMigrationInitializer beans by type rather than name.
Fixes gh-18105
52311ffe3c