Add new link entries in devfile registry for devfile v2

[benoitf]

Is your task related to a problem? Please describe.

For now, we have meta.yaml with self links pointing to devfile.yaml
For devfile v2, we'll need to have links to v2 devfiles. But also as the idea is to be "repository first" instead of "devfile first", the links should be pointers to repositories.

Describe the solution you'd like

Add v2 links in addition to the self-links.

for example

"v2": "http://github.com/my/repository/tree/1.x"

to use the 1.x branch of this git repository

Describe alternatives you've considered

Additional context

as part of #19718, some other entries would be defined like

prebuilt: 
   - "che-theia/next": "/path/to/all-in-one-che-theia-next.yaml"
   - "che-theia/latest": "/path/to/all-in-one-che-theia-latest.yaml"
   - "intellij/latest": "/path/to/all-in-one-intellij-latest.yaml"

For offline builds, we may still need to copy the repository devfile.yaml instead of using repository link

[benoitf]

Fixed by eclipse-che/che-devfile-registry#408