Provide a checkoutFrom.revision url parameter for factoryUrl

[dkwon17]

Is your enhancement related to a problem? Please describe

This enhancement is an alternative to #21921

When creating a workspace with a factory url with a branch:

{CHE-HOST}/#https://github.com/eclipse-che/che-plugin-registry/tree/7.59.x

The checkoutFrom.revision for the resulting DW is 7.59.x, meaning, when opening the workspace, the branch that is checked out is 7.59.x:

projects:
  - git:
      checkoutFrom:
        revision: 7.59.x
      remotes:
        origin: 'https://github.com/eclipse-che/che-plugin-registry'
    name: che-plugin-registry

But, if we take the url above and configure remotes on top of it, by setting origin to https://github.com/dkwon17/che-plugin-registry and upstream to https://github.com/eclipse-che/che-plugin-registry:

{CHE-HOST}/#https://github.com/eclipse-che/che-plugin-registry/tree/7.59.x?remotes={{origin,https://github.com/dkwon17/che-plugin-registry},{upstream,https://github.com/eclipse-che/che-plugin-registry}}

The checkoutFrom.revision is not set in this case, because there is no guarantee that the 7.59.x branch exists in the newly configured origin remote:

projects:
  - git:
      checkoutFrom:
        remote: origin
      remotes:
        origin: 'https://github.com/dkwon17/che-plugin-registry'
        upstream: 'https://github.com/eclipse-che/che-plugin-registry'
    name: che-plugin-registry

Therefore, it would be great to have some way to configure the checkoutFrom.revision field when specifying remotes.

Describe the solution you'd like

Have checkoutFrom.revision configurable with a url parameter

Describe alternatives you've considered

#21921

Additional context

This feature is helpful for redhat-actions/try-in-web-ide#14, since it would help the GitHub action to set up remotes as well as set up the checkoutFrom.revision branch.

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