Wrong hash generated for star activities

[epipav]

Changes proposed ✍️

• Webhooks and onboardings were generating different hashes because webhooks were using the UNIX timestamp string, but onboardings were using the date string when generating the sourceId hash.
• Now, onboardings also use the UNIX timestamp when generating the hash.
• Also, there's a temp fix in automations, where we discard the star activities temporarily (Will onboard GitHub integrations and remove this part)

Checklist ✅

• Label appropriately with Feature, Enhancement, or Bug.
• Tests are passing.
• New backend functionality has been unit-tested.
• Environment variables have been updated:
  • Local frontend configuration: frontend/.env.dist.local, frontend/.env.dist.composed.
  • Local backend: backend/.env.dist.local, backend/.env.dist.composed.
  • Configuration docs have been updated.
  • Team members only: update environment variables in override, staging and production env. files and trigger update config script.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.
• All changes have been tested in a staging site.
• All changes are working locally running crowd.dev's Docker local environment.