[8.4.x]: SQLStore: Prevent concurrent migrations (#44101) (#45447)

* SQLStore: Prevent concurrent migrations (#44101)

* SQLStore: Prevent concurrent migrations

* Hide behind a feature toggle

* Configurable locking attempt timeout

* Update docs/sources/administration/configuration.md

Co-authored-by: Igor Suleymanov <radiohead@users.noreply.github.com>
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
(cherry picked from commit d718ee1918)

* Resolve dependency cycle (#45427)

(cherry picked from commit 6a38ce2307)

pkg/cmd/grafana-cli/commands/commands.go

@@ -55,6 +55,7 @@ func runDbCommand(command func(commandLine utils.CommandLine, sqlStore *sqlstore
 		if err != nil {
 			return errutil.Wrap("failed to initialize tracer service", err)
 		}
+
 		sqlStore, err := sqlstore.ProvideService(cfg, nil, bus.GetBus(), &migrations.OSSMigrations{}, tracer)
 		if err != nil {
 			return errutil.Wrap("failed to initialize SQL store", err)