Parse launcher schema by survey type

[MebinAbraham]

What is the context of this PR?

Updates launcher to work with ONSdigital/eq-questionnaire-runner#731
Runner schemas are now grouped by survey type. The changes have been kept to a minimum, could be refactored further but didn't think it was worth it.

How to review

• Run this branch of launcher locally or point your launcher to this branch in runner's docker compose file.
• Ensure launcher works as expected and no existing functionality have been broken..
• Add a new survey type dir into runner schemas/ dir with an appropriate schema and ensure launcher is able to pick it up.

[LJBabbage]

So I tested social and business, added another survey type and added metadata, all was good. I even added a welsh version into one of the business surveys and it worked as before. I did see a problem with json file name which I will put on the other PR