Unified: Run resource data migrations at startup (#114857)

* chore: uncomment unified migration

* chore: adapt and fix tests

* chore: dynamically bump max conns if needed during migration

* chore: copilot suggestions

* chore: pass ctx in RegisterMigration

* chore: make playlists opt-out and dashboards opt-in

* chore: adjust dashboard test

* chore: disable enable log in test

* chore: address review comments

- do not use pointer config
- add migration registry

* chore: more consistent naming

* chore: fix playlist discovery test

pkg/tests/api/annotations/annotations_test.go

@@ -32,8 +32,9 @@ func TestIntegrationAnnotations(t *testing.T) {
 	testutil.SkipIntegrationTestInShortMode(t)
 
 	dir, path := testinfra.CreateGrafDir(t, testinfra.GrafanaOpts{
-		DisableAnonymous:     true,
-		EnableFeatureToggles: []string{featuremgmt.FlagAnnotationPermissionUpdate},
+		DisableAuthZClientCache: true,
+		DisableAnonymous:        true,
+		EnableFeatureToggles:    []string{featuremgmt.FlagAnnotationPermissionUpdate},
 	})
 	grafanaListedAddr, env := testinfra.StartGrafanaEnv(t, dir, path)
 	noneUserID := tests.CreateUser(t, env.SQLStore, env.Cfg, user.CreateUserCommand{