Chore: Refactor quota service (#57586)

* Chore: refactore quota service

* Apply suggestions from code review

pkg/setting/setting.go

@@ -153,9 +153,6 @@ var (
 	LDAPAllowSignup       bool
 	LDAPActiveSyncEnabled bool
 
-	// Quota
-	Quota QuotaSettings
-
 	// Alerting
 	AlertingEnabled            *bool
 	ExecuteAlerts              bool
@@ -422,12 +419,12 @@ type Cfg struct {
 	LDAPSkipOrgRoleSync bool
 	LDAPAllowSignup     bool
 
-	Quota QuotaSettings
-
 	DefaultTheme  string
 	DefaultLocale string
 	HomePage      string
 
+	Quota QuotaSettings
+
 	AutoAssignOrg              bool
 	AutoAssignOrgId            int
 	AutoAssignOrgRole          string
@@ -1053,11 +1050,12 @@ func (cfg *Cfg) Load(args CommandLineArgs) error {
 	cfg.readAzureSettings()
 	cfg.readSessionConfig()
 	cfg.readSmtpSettings()
-	cfg.readQuotaSettings()
 	if err := cfg.readAnnotationSettings(); err != nil {
 		return err
 	}
 
+	cfg.readQuotaSettings()
+
 	cfg.readExpressionsSettings()
 	if err := cfg.readGrafanaEnvironmentMetrics(); err != nil {
 		return err