shed: migrations: add reminder about continuity testing tool

[arajasek]

Related Issues

We didn't remember to run this tool in time for the nv19 upgrade. We should add this to our network upgrade testing checklist.

Proposed Changes

But also add a reminder in code :P

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green

[jennijuju]

Description is a “lie”! We did!! Asked our friend @raulk help on Apr 18th!

But don’t mind additional reminders and team wide awareness