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>

.github/CODEOWNERS

@@ -71,6 +71,7 @@
 /pkg/registry/apis/provisioning @grafana/grafana-git-ui-sync-team
 
 /apps/alerting/ @grafana/alerting-backend
+/apps/dashboard/ @grafana/grafana-app-platform-squad @grafana/dashboards-squad
 /apps/playlist/ @grafana/grafana-app-platform-squad
 /apps/investigations/ @fcjack @matryer @svennergr
 /apps/advisor/ @grafana/plugins-platform-backend