* wire experiments through options for tests (#21873)

helper/experiments/experiments.go

@@ -6,11 +6,13 @@ package experiments
 const (
 	VaultExperimentEventsAlpha1          = "events.alpha1"
 	VaultExperimentCoreAuditEventsAlpha1 = "core.audit.events.alpha1"
+	VaultExperimentSecretsSyncAlpha1     = "secrets.sync.alpha1"
 )
 
 var validExperiments = []string{
 	VaultExperimentEventsAlpha1,
 	VaultExperimentCoreAuditEventsAlpha1,
+	VaultExperimentSecretsSyncAlpha1,
 }
 
 // ValidExperiments exposes the list without exposing a mutable global variable.