Fully change project name for Jakarta REST
For Jakarta REST there's still a number of references to "jaxrs", for instance in "https://projects.eclipse.org/projects/ee4j.jaxrs" and "https://ci.eclipse.org/jaxrs"
As per request from the majority of committers (https://www.eclipse.org/lists/jaxrs-dev/msg01072.html), we would like to remove these old references so it becomes "https://projects.eclipse.org/projects/ee4j.rest", etc.
Note that the GitHub repo has already been renamed before: https://github.com/jakartaee/rest
If the mailing list can't be renamed (as we saw with other projects) that's okay and it can remain at "jaxrs-dev@eclipse.org".