feat: enable auto migration based on resource count (#115619)

* feat(unified): migration at startup based on resource count

-- draft

* feat: introduce auto migration enablement for dashboards & folders

* feat: enable auto migration based on threshold

* fix: improve

* fix: pass in the auto migrate per migration definition

* fix: minor

* fix: only use one options

* fix: test

* fix: test

* fix: tests

* fix: simplify configs

* chore: rename

* fix: add integration test

* fix: add integration test

* fix: integration tests

* chore: add comments

* fix: address comment

* fix: address comments

* fix: test and auto migration flow

* fix: test

---------

Co-authored-by: Rafael Paulovic <rafael.paulovic@grafana.com>

pkg/tests/testinfra/testinfra.go

@@ -557,6 +557,8 @@ func CreateGrafDir(t *testing.T, opts GrafanaOpts) (string, string) {
 			require.NoError(t, err)
 			_, err = section.NewKey("enableMigration", fmt.Sprintf("%t", v.EnableMigration))
 			require.NoError(t, err)
+			_, err = section.NewKey("autoMigrationThreshold", fmt.Sprintf("%d", v.AutoMigrationThreshold))
+			require.NoError(t, err)
 		}
 	}
 	if opts.UnifiedStorageEnableSearch {