feat(dashboard): Org-aware cache for schema migration (#115025)

* fix: use dsIndexProvider cache on migrations

* chore: use same comment as before

* feat: org-aware TTL cache for schemaversion migration and warmup for single tenant

* chore: use LRU cache

* chore: change DefaultCacheTTL to 1 minute

* chore: address copilot reviews

* chore: use expirable cache

* chore: remove unused import

pkg/setting/setting.go

@@ -247,11 +247,12 @@ type Cfg struct {
 	MetricsGrafanaEnvironmentInfo    map[string]string
 
 	// Dashboards
-	DashboardVersionsToKeep     int
-	MinRefreshInterval          string
-	DefaultHomeDashboardPath    string
-	DashboardPerformanceMetrics []string
-	PanelSeriesLimit            int
+	DashboardVersionsToKeep          int
+	MinRefreshInterval               string
+	DefaultHomeDashboardPath         string
+	DashboardPerformanceMetrics      []string
+	PanelSeriesLimit                 int
+	DashboardSchemaMigrationCacheTTL time.Duration
 
 	// Auth
 	LoginCookieName               string
@@ -1237,6 +1238,7 @@ func (cfg *Cfg) parseINIFile(iniFile *ini.File) error {
 	cfg.DefaultHomeDashboardPath = dashboards.Key("default_home_dashboard_path").MustString("")
 	cfg.DashboardPerformanceMetrics = util.SplitString(dashboards.Key("dashboard_performance_metrics").MustString(""))
 	cfg.PanelSeriesLimit = dashboards.Key("panel_series_limit").MustInt(0)
+	cfg.DashboardSchemaMigrationCacheTTL = dashboards.Key("schema_migration_cache_ttl").MustDuration(time.Minute)
 
 	if err := readUserSettings(iniFile, cfg); err != nil {
 		return err