Previously, the configuration metadata annotation processor only
declared support for `@Endpoint` and none of the other more
specialized `@…Endpoint` annotations that are meta-annotated with
`@Endpoint` such as `@WebEndpoint` and `@JmxEndpoint. This would
result in missing metadata if a full or incremental build only
compiled classes annotated with one of the more specialized
`@…Endpoint` annotations as the annotation processor would not be
called.

This commit updates the processor's supported annotation types to
include every known `@…Endpoint` annotation. The test processor has
also been similarly updated to align its behaviour with that of the
main processor.

Fixes gh-25388