Re-enable download of zip files in front end

[masonlr]

Description

Re-enable button to download zip file of outputs

• [x] Downloads to support multiple file types (json, csv, zip)

Acceptance criteria

• [x] Download buttons render in frontend
• [x] Infrastructure added in Middleware/Manager/Simulator/Storage to support building of dynamic download list

Out of scope

Implementation notes

• Simulator can add downloads to the job outputs list at run time

[masonlr]

We need to support filename attribute in outputs structure. This will be used to specify downloaded filename.