so that we can reuse steps from tekton catalog or any git repository or OCI bundle easily to promote reuse and avoid copy and paste

so that we can reuse steps in all tekton resources

and align with the TaskRef struct in tekton.

also lets rename the git URI to `git` instead of `path` so its more explicit and fits more cleanly with the `TaskRef`

as it adds complexity and no longer seems terribly useful when uses: can be a ref/bundle/git

so that a single string, `git` can be used like `bundle` to reference versioned files in any git repository using `kpt` style URIs.

Improved support for non-github servers

Given its a single simple string URI, we could also reuse `git` on `TaskRef` some day to reference Tasks on Pipelines using git.

as we no longer need it

we can then simplify `Uses` to just be an optional `step` name to indicate whether a single step is being used or all of the steps.

We can then look to reuse the git resource loading for `Pipeline.taskRef` too like we do for `bundle`

so we can load Tasks from git too

as it leads to the confusing 'name' property; lets use 'task' instead then its more clear. It also helps us have better comments to properly describe when and why you would use the 'task' property when using a bundle or git