(#22807) Document certificate_status endpoint
(maint) Rename validate_as_json to be specific

This renames validate_as_json methods to be specific to the schema they are
validating (since that's embedded in each definition) and inlines the
implementations that didn't need to be abstracted.
(#22807) Add examples for certificate_status
Merge pull request #1979 from pcarlisle/ticket/22807-document-certificate_status

(#22807) Document certificate_status endpoint