Fix Readiness check (#8681)

- Remove goroutine-check in Readiness check
- Bring in quorum check for readiness

Fixes #8385

Co-authored-by: Harshavardhana <harsha@minio.io>

cmd/object-api-interface.go

@@ -122,4 +122,7 @@ type ObjectLayer interface {
 
 	// Backend related metrics
 	GetMetrics(ctx context.Context) (*Metrics, error)
+
+	// Check Readiness
+	IsReady(ctx context.Context) bool
 }