cucumber / cucumber-jvm / 3987

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[Spring] Remove cucumber.xml and implied context configuration (#1959)

The preferred way to use `cucumber-spring` is to annotate a class
with both `@CucumberContextConfiguration` and a Spring context
configuration annotation such as `@ContextConfiguration`,
`@SpringBootTest`, ect.

Previously Cucumber would support the discovery of context
configuration on any step definition class. This requires a
significant amount of code and intimate knowledge of the
Spring Framework.
By restricting this too only classes annotated with
`@CucumberContextConfiguration` we remove this complexity and
simply pass the annotated class to Spring `TestContextManager`
framework.

If no context configuration is available Cucumber currently also
supports reading the application context from a magical
`cucumber.xml` file or should none exist an empty application
context.
Both these fallback strategies tend to hide user errors. And
removing them will provide more clarity and also removes
a nugget of complexity.

Closes: #1904

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