Flow file monitor should not traverse into node_modules

[mhsdesign]

There is currently no guarding against monitoring everything out of node_modules.
As this is such a common preserved folder i would not expect anyone sane for using it for real. And in turn expect flow to not traverse into it while listening for changes:

flow-development-collection/Neos.Flow/Classes/Monitor/FileMonitor.php

Lines 347 to 354 in dad6970

	protected function readMonitoredDirectoryRecursively($path, $filenamePattern)
	{
	$directories = [Files::getNormalizedPath($path)];
	while ($directories !== []) {
	$currentDirectory = array_pop($directories);
	if (is_file($currentDirectory . '.flowFileMonitorIgnore')) {
	continue;
	}

I did not measure the impact but i simply cannot imagine that accidentally monitoring node_modules is ever a good idea.