Use TestContainers to startup an Infinispan dependency in example projects

At the moment, there is a port conflict when running "mvn clean test -Ppersistence" from the examples parent.

In order to run the tests using the profile, some examples need an external Infinispan instance when others handle its own Infinispan instance using the TestContainers framework (which uses Docker as a requirement).

This task is about to use the TestContainers in all the examples that expect an Infinispan instance. Therefore, the external Infinispan instance will be no longer needed.