Incomplete release notes generated due to the Velocity parsing of the template content

The release notes generation code that is executed when creating a new release plan uses the assumption that it needs to evaluate the Velocity $product variable inside the release notes template document's content.

The downside of doing this is that ## wiki syntax will be handled as a comment and will break the output of the release notes content. An example is the migration General Notes section content that gets truncated:

== General Notes ==

When upgrading make sure you compare your 

The template has evolved and we now have both the version and the product strings inside an XObject inside each release notes documents, so we should use that with the velocity macro instead and stop parsing the entire template content as velocity, thus handling both Product and Version consistently.