tests: Clean up dsync package (#14415)

Add non-constant timeouts to dsync package.

Reduce test runtime by minutes. Hopefully not too aggressive.

cmd/namespace-lock.go

@@ -225,6 +225,7 @@ func (n *nsLockMap) NewNSLock(lockers func() ([]dsync.NetLocker, string), volume
 	if n.isDistErasure {
 		drwmutex := dsync.NewDRWMutex(&dsync.Dsync{
 			GetLockers: lockers,
+			Timeouts:   dsync.DefaultTimeouts,
 		}, pathsJoinPrefix(volume, paths...)...)
 		return &distLockInstance{drwmutex, opsID}
 	}