Dashboard Migrations: V6 pulldowns to annotations; variables (#112221)

* migrate to v19

* migrate to v18

* Migration to be verified: v17 Convert minSpan to maxPerRow in panels

* Migration to be verified: 16 Grid layout migration

* Refactor v17 and v19 migrations to use shared helper functions

* Migration to be verified: 15 No-op migration for schema consistency

* Migration to be verified: 14 Shared crosshair to graph tooltip migration

* cleanup

* wip

* complete migration

* fix lint issues

* refactor and test with minimal graph config

* update tests

* migrate to v12

* extract defaults outside the func

* lint

* lint

* add missing showValues prop

* migrate to v11

* migrate to v10

* add test files

* update

* migrate to v9

* migrate to v8

* add context and fix latest version

* add context

* add context

* generate snapshots

* v13 should be no-op

* clean up

* fix tests

* add context

* snapshots

* generate snapshots

* update

* snapshots

* wip

* fix test

* remove nav when cleaning up defaults

* migrate to v6

* update comments

* remove v28

* remove singlestat migraiton from frontend migrator because this is an automigration

* remove unused function

* Remove v24 table plugin logic

* cleanup

* remove plugin version for automigrate as it was used only in v24 and v28 that have been removed

* cleanup

* update snapshot

* update snapshot

* update snapshot

* update snapshot

* remove test

---------

Co-authored-by: Dominik Prokop <dominik.prokop@grafana.com>

apps/dashboard/pkg/migration/migrate.go

@@ -126,7 +126,11 @@ func (m *migrator) migrate(ctx context.Context, dash map[string]interface{}, tar
 		}
 	}
 
-	// 6. Clean up the dashboard to match frontend getSaveModel behavior
+	// 6. Add built-in annotation query after all migrations are complete
+	// This matches the frontend DashboardModel constructor behavior
+	addBuiltInAnnotationQuery(dash)
+
+	// 7. Clean up the dashboard to match frontend getSaveModel behavior
 	// This removes properties that shouldn't be persisted and filters out default values
 	cleanupDashboardForSave(dash)