Tests using @Testcontainer must not run in-container

[jasondlee]

Currently, we do not support @TestContainer running inside a container (e.g., WildFly). We should add checks to make sure this doesn't happen. If class has a field with @TestContainer:

• Check for @deployment
• If found, verify that testable=false is set
• Verify that class is annotated with @RunAsClient
• If either of these checks fail, error out so the test fails early and with a meaningful message