feat: Update grafana api

[raelga]

Updates the Grafana API and generators to match the latest specification.

/kind maintenance /priority critical-urgent /assign

[3scale-robot]

@raelga: The label(s) kind/maintenance cannot be applied, because the repository doesn't have them.

In response to [this](https://github.com/3scale-ops/saas-operator/pull/186): >Updates the Grafana API and generators to match the latest specification. > >/kind maintenance >/priority critical-urgent >/assign Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[raelga]

/kind bug

[slopezz]

/lgtm

[3scale-robot]

LGTM label has been added.

Git tree hash: a934cb39510148ad39bd3c02c25bce1ab8b75bf2

[slopezz]

/lgtm

[3scale-robot]

LGTM label has been added.

Git tree hash: a0a76001ccdbcc116cc329f99e533e51dd85bcff

[raelga]

/approve

[3scale-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: raelga

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/3scale-ops/saas-operator/blob/main/OWNERS)~~ [raelga] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[slopezz]

Related to https://github.com/3scale/platform/issues/996