Update the rancher dynamic client to use its concrete struct types

[git-ival]

Issue:

Problem

As a developer attempting to debug issues while using the dynamic client, it was difficult to follow what code implemented the underlying functions. This was due to the dynamic client functions returning the upstream k8s dynamic client types instead of the concrete ones of the rancher dynamic client.

Solution

Update the dynamic client and other references to it so that they reference the concrete rancher dynamic client types.

Testing

Was able to build locally, have not run any tests from the rancher/rancher repo that might utilize the dynamic client. Custom tests utilizing the rancher dynamic client were able to run successfully and made debugging a bit easier.

Engineering Testing

Manual Testing

Automated Testing

QA Testing Considerations

Regressions Considerations

There should not be regressions as this is a minor change that updates the types to the concrete ones provided in the rancher dynamic client code.

Existing / newly added automated tests that provide evidence there are no regressions: N/A

[caliskanugur]

Looks solid, I've got a few questions and a naming nit

[git-ival]

@caliskanugur Anything else needed on my end before this can be reviewed?

[igomez06]

LGTM I think this looks good, we'll need to merge this as separate version bump, just to make sure there aren't any regressions in rancher.