Chore: Move dashboard models to dashboard pkg (#61458)

* Copy dashboard models to dashboard pkg

* Use some models from current pkg instead of models

* Adjust api pkg

* Adjust pkg services

* Fix lint

pkg/services/libraryelements/libraryelements_get_test.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/grafana/grafana/pkg/components/simplejson"
+	"github.com/grafana/grafana/pkg/services/dashboards"
 	"github.com/grafana/grafana/pkg/services/org"
 	"github.com/grafana/grafana/pkg/web"
 	"github.com/stretchr/testify/require"
@@ -115,12 +116,12 @@ func TestGetLibraryElement(t *testing.T) {
 					},
 				},
 			}
-			dash := models.Dashboard{
+			dash := dashboards.Dashboard{
 				Title: "Testing getHandler",
 				Data:  simplejson.NewFromAny(dashJSON),
 			}
 			dashInDB := createDashboard(t, sc.sqlStore, sc.user, &dash, sc.folder.ID)
-			err := sc.service.ConnectElementsToDashboard(sc.reqContext.Req.Context(), sc.reqContext.SignedInUser, []string{sc.initialResult.Result.UID}, dashInDB.Id)
+			err := sc.service.ConnectElementsToDashboard(sc.reqContext.Req.Context(), sc.reqContext.SignedInUser, []string{sc.initialResult.Result.UID}, dashInDB.ID)
 			require.NoError(t, err)
 
 			expected := func(res libraryElementResult) libraryElementResult {