feat: deprecate /v2/content/:msaId/on-chain, add /v3/content/on-chain, e2e tests

[JoeCap08055]

Purpose

The goal of this PR is to remove :msaId from the path paramters of the on-chain announcement endpoint.

Deprecated: POST /v2/content/:msaId/on-chain
Added: POST /v3/content/on-chain

Also added intentName to the payload.

• If intentName is present:
  • if no schemaId present, use the latest schema for the intent
  • if schemaId is present, validate that it implements the associated intent & use it
• if schemaId is present:
  • if no intentName is present, use the schema ID

Checklist

items that don't apply can be marked NA or deleted

• end-to-end tests added
• Documentation added or updated (where applicable)
• API endpoints added or changed? Added the endpoints in main.ts and regenerated Swagger docs
• Breaking changes? "breaking changes" label added

Additional details / screenshot

• Any supplemental pictures or material