account for api changes

[alishaevn]

Summary

update all instances of proposal_ref and quoted_ware throughout the app

Acceptance Criteria

• all instances of proposal_ref have been updated to proposal_refs
• all instances of quoted_ware have been updated to quoted_wares
• full functionality has been tested and confirmed that it's still operational
• this change has been pulled into all client apps
  • account for api changes phenovista-digital-storefront#30

Story

From mumen yesterday:

I’ve made some recent changes to the PO serializer on the API that might affect some of the work you’re doing. I can’t fully identify the app using the API endpoint but I do see events being made to the API by Alisha/Adelle/Andrew. The mapping changes I’ve made can be seen here: https://github.com/assaydepot/scientist_api_v2/pull/305/files#diff-def1c18bae072f37cb9dbaac42ba8234752e455f5b3bb719029386f323071c84

You will see a plural form of some of the mappings. For example, I’ve added proposal_refs which can map to multiple of proposals. I’ve left the singular mapping proposal_ref as-is so things don’t break but the idea is that a PO can now have multiple proosals. The same applies to quoted_wares. So in whatever app you’ve developed that accessed the endpoint, we’d need to update it to read the plural mapping.

it's a non breaking change since I did not change the existing mappings, I just added the plural form of the mappings so we can transition over without blowing up anything