* Enable Attribute Filter block to work with the PHP rendered Classic Template block
* Check for presence of option before rendering it
* improve filter product by attribute
* fix pagination problem
* fix check when two filter block with same attribute are used
* fix filter by stock for PHP templates
* fix naming and comment
* Update filter key in ClassicTemplate
* Update stock filter block for PHP templates when the filter button is enabled
* Remove unused useEffect and fix ESLint error
* Set active stock filter and track using local state
* ESLint fix
* Remove unncessary dependencies from useEffect
Co-authored-by: tjcafferkey <tjcafferkey@gmail.com>