Adding logic to prevent ”non-positive interval for newticker” (WIP) (#10532)

* Adding logic to prevent `”non-positive interval for newticker”`

* Update vault/quotas/quotas_rate_limit.go

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Co-authored-by: Violet Hynes <a.xenasis@gmail.com>
Co-authored-by: Violet Hynes <violet.hynes@hashicorp.com>

vault/quotas/quotas_rate_limit.go

@@ -219,6 +219,9 @@ func (rlq *RateLimitQuota) initialize(logger log.Logger, ms *metricsutil.Cluster
 // in which we stop the ticker and return.
 func (rlq *RateLimitQuota) purgeBlockedClients() {
 	rlq.lock.RLock()
+	if rlq.purgeInterval <= 0 {
+		rlq.purgeInterval = DefaultRateLimitPurgeInterval
+	}
 	ticker := time.NewTicker(rlq.purgeInterval)
 	rlq.lock.RUnlock()