Update launcher to support multiple schema versions

[VirajP1002]

What is the context of this PR?

Given the schema_version now has multiple versions, Launcher needed to be updated to support this where the data would update dynamically when choosing a different sds_dataset_id. Previously, when changing versions, it would add the dataset keys to the existing ones resulting in repeated fields. The changes made to the JS and HTML prevents that from occurring.

Ensure you use the Mock SDS PR when reviewing this to get the multiple schema versions for Supplementary Data. Make sure you use the Runner PR too, to ensure that you can open schemas with multiple versions.

How to review

• Ensure the changes make sense
• Ensure you can open schemas
• Ensure you select a different sds_dataset_id and the fields update correctly.