refactor: use openapi client for dashboard controller

[theSuess]

This PR is a partial implementation of #1357. It only concerns itself with the dashboard controller to set the stage for other controllers to follow suit.

Tested normal use cases with a local instance & Grafana Cloud but would appreciate some more edge use cases to explore

[theSuess]

Looks like we need to swap out folder IDs for folder UIDs as the linter will continue to complain about deprecated fields

Should we add this to this PR as well, or ignore the linter errors for now and follow up in a separate PR?

[NissesSenap]

Good question. I'm in a cab right now so I can't look at the code. Won't changing from id to uid be a breaking change? I can't remember how we define the crd.

It sounds easiest to ignore the linter for now and create a separate issue/pr around it. Do you think it will be a big refactor to do?

[theSuess]

From what I've gathered during switching the implementation, the ID changes would only be internal and never exposed to the user. I'll try to implement it to see how much this changes, and we can revert the commit if someone notices a way in which this might break

[HVBE]

Looks good to me! Thanks!

[pb82]

LGTM, just a question about the paginated API