Completes OPEN-3490 Create a method inside the CommitBundleValidator …

[gustavocidornelas]

…that validates all resources individually

• For a commit bundle, includes the individual resource validation. This is done mostly to simplify the commit bundle validation on the backend (introduced by this PR)
• There are minor issues with the way these additional validations are being done. The main one being that the datasets and models are essentially validated twice: once on the add and once on the push. I can allow for something like skip_validations in the future. I'll also change the references to "training", "validation", and "model" to use an enum, like we do for the backend.

[linear]

OPEN-3490 Create a method inside the CommitBundleValidator that validates all resources individually