K8s/Dashboards: Generate Dashboards k8s APIs using Grafana App SDK (#99966)

* Generate Dashboard kinds with `grafana-app-sdk`

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Hack together a fix for invalid TS codegen for v0 & v1

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Address Go linter issues

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Address TS linter issues

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Add new app to CODEOWNERS

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Fix a couple of issues detected by tests

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Update OpenAPI definitions and test files

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Remove title from Dashboard v1alpha1 spec

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Remove unused CUE schemas

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* remove unrelated files

* allow any in the generated betterer

* Add a comment explaining why we don't use deepcopy-gen

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

* Default to v2alpha1 if dashboards v2 FF is enabled

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>

---------

Signed-off-by: Igor Suleymanov <igor.suleymanov@grafana.com>
Co-authored-by: Ryan McKinley <ryantxu@gmail.com>

pkg/tests/apis/dashboard/testdata/dashboard-test-v2.yaml

@@ -4,3 +4,7 @@ metadata:
   name: test-v2
 spec:
   title: Test dashboard. Created at v2
+  layout:
+    kind: GridLayout
+    spec:
+      items: []