proposal: rename `ticketURI` in incident to consistent with one of the existing format

[davidB]

I propose to rename the field ticketURI used in incident, several options (depends of the consistency target):

1. ticketUrl to be consistent with other 'uri' field like url and viewUrl (related to type of url fields is inconsistent into jsonschema #191)
2. ticketId to be consistent with artifactId and URI field that are used as id or references
3. ticket.uri to be consistent with sbom.uri or with subject.content.uri (of a ticket)
4. ticketUri to be consistent with "casing" of other fields

This ticket is also related to #252