Add platform filter

[adam7rans]

So we need to be able to capture the platform that the job page is hosted on and then display that in the job card and also add a platform filter

The idea of being here that a user can just apply to all platform jobs like greenhouse where the selector is working perfectly and all their answers are already pre-filled out so they can just like by really fast instead of having to struggle with redoing the selection every time or doing this selection every time and then filling out the form every time. It's just a different mode quicker mode of working.