Limit Bean Validation processing requirement

[Azquelt]

Only require Bean Validations to be processed for creating the OpenAPI document if support for Jakarta Bean Validation is actually present.

• Add spec wording
• Add Bean Validation tests to a group
• Update TCK readme to explain how to exclude the group

Also fix formatting error in the bean validation section of the spec, bullet lists need to be preceded by a blank line.

Fixes #540

[Azquelt]

This will need an update if it's merged after #538

[Azquelt]

Updated to add the bean validation group to the test added in #538