Add feature to pass variable from previous nodes to firecrawl action node

This would enable an indexation source in use case management, where users want to crawl their website based on their configurations. Currently, we would have to manually punch in the configurations while development.

Feature : Ability to allow users to pass variables from previous node(s) to firecrawl action node config

Why : Want to allow users to dynamically set config of action node while preparing an indexation flow. (Particularly for use case management)
When : Primarily needed to allow crawling feature to use case management