Schema: convert dashboards from v1beta1 to v2beta1 (#109037)

- Implement full conversion pipeline from v1beta1 → v2beta1
- Ensure frontend–backend parity for all dashboard serialization paths
- Add automatic data loss detection for conversions (panels, queries, annotations, links, variables)
- Extract atomic conversion functions for v0 → v1beta1 → v2alpha1 → v2beta1
- Introduce conversion metrics and detailed logging for loss tracking
- Normalize datasource resolution, defaults, and annotation processing
- Improve panel layout serialization and y-coordinate normalization
- Fix inconsistencies in nested panels and collapsed row behavior
- Refine variable handling:
  - Filter refId from variable query specs
  - Default variable refresh to 'never' (matches frontend)
  - Fix constant and interval variable handling for missing queries
- Unify schema defaults (enable, hide, iconColor, editable, liveNow)
- Fix pluginId usage (UID vs type) and datasource references
- Fix metrics.go bug swallowing errors (return nil → return err)
- Add tests for version-specific conversion error handling
- Add data loss detection tests using source/target version comparison
- Clean up lint issues, legacy code, and redundant files
- Update OpenAPI snapshots and migrated dashboards
- Improve backend migrator to reuse datasource provider and match frontend logic

Co-authored-by: Haris Rozajac <haris.rozajac12@gmail.com>
Co-authored-by: Oscar Kilhed <oscar.kilhed@grafana.com>
Co-authored-by: Stephanie Hingtgen <stephanie.hingtgen@grafana.com>

pkg/registry/apis/dashboard/datasources.go

@@ -4,6 +4,7 @@ import (
 	"context"
 
 	"github.com/grafana/grafana/apps/dashboard/pkg/migration/schemaversion"
+	"github.com/grafana/grafana/pkg/services/apiserver/endpoints/request"
 	"github.com/grafana/grafana/pkg/services/datasources"
 )
 
@@ -11,9 +12,20 @@ type datasourceInfoProvider struct {
 	datasourceService datasources.DataSourceService
 }
 
-func (d *datasourceInfoProvider) GetDataSourceInfo(_ context.Context) []schemaversion.DataSourceInfo {
-	query := datasources.GetAllDataSourcesQuery{}
-	dataSources, err := d.datasourceService.GetAllDataSources(context.Background(), &query)
+func (d *datasourceInfoProvider) GetDataSourceInfo(ctx context.Context) []schemaversion.DataSourceInfo {
+	// Extract namespace info from context to get OrgID
+	nsInfo, err := request.NamespaceInfoFrom(ctx, true)
+	if err != nil {
+		// If namespace info is not available, return empty list
+		return []schemaversion.DataSourceInfo{}
+	}
+
+	// Use GetDataSources with OrgID query instead of GetAllDataSources
+	// This ensures tenant-aware datasource retrieval
+	query := datasources.GetDataSourcesQuery{
+		OrgID: nsInfo.OrgID,
+	}
+	dataSources, err := d.datasourceService.GetDataSources(ctx, &query)
 
 	if err != nil {
 		return []schemaversion.DataSourceInfo{}