ValidatedQueries: start of validated queries API (#44731)

* adds an api endpoint for use with public dashboards that validates orgId, dashboard, and panel when running a query. This feature is in ALPHA and should not be enabled yet. Testing is based on new mock sqlstore.

Co-authored-by: Jesse Weaver <jesse.weaver@grafana.com>
Co-authored-by: Leandro Deveikis <leandro.deveikis@gmail.com>

pkg/models/dashboards.go

@@ -21,6 +21,16 @@ var (
 		StatusCode: 404,
 		Status:     "not-found",
 	}
+	ErrDashboardCorrupt = DashboardErr{
+		Reason:     "Dashboard data is missing or corrupt",
+		StatusCode: 500,
+		Status:     "not-found",
+	}
+	ErrDashboardPanelNotFound = DashboardErr{
+		Reason:     "Dashboard panel not found",
+		StatusCode: 404,
+		Status:     "not-found",
+	}
 	ErrDashboardFolderNotFound = DashboardErr{
 		Reason:     "Folder not found",
 		StatusCode: 404,
@@ -105,6 +115,18 @@ var (
 		Reason:     "Unique identifier needed to be able to get a dashboard",
 		StatusCode: 400,
 	}
+	ErrDashboardIdentifierInvalid = DashboardErr{
+		Reason:     "Dashboard ID not a number",
+		StatusCode: 400,
+	}
+	ErrDashboardPanelIdentifierInvalid = DashboardErr{
+		Reason:     "Dashboard panel ID not a number",
+		StatusCode: 400,
+	}
+	ErrDashboardOrPanelIdentifierNotSet = DashboardErr{
+		Reason:     "Unique identifier needed to be able to get a dashboard panel",
+		StatusCode: 400,
+	}
 	ErrProvisionedDashboardNotFound = DashboardErr{
 		Reason:     "Dashboard is not provisioned",
 		StatusCode: 404,