Produce migration report for staged contracts migration

[j1010001]

Issue to be solved

Goal: developers can access the result of the migration of their staged contract

• Generate a report in the migration Report the status of staged contract updates flow-go#5630
• Improve JSON encoding of reporter entries flow-go#5675
• Publish the results in a public domain, in a more user-friendly format Tool for converting staged contracts migration report from JSON to Markdown #3249
• Setup a way to periodically update the results after migrations / as more contracts get staged.

Suggested Solution

No response