Add activity feed API

[Julien-Ben]

Summary

Proof of Work

Checklist

• Have you linked a jira ticket and/or is the ticket in the title?
• Have you checked whether your jira ticket required DOCSP changes?
• Have you added changelog file?
  • use skip-changelog label if not needed
  • refer to Changelog files and Release Notes section in CONTRIBUTING.md for more details

[Julien-Ben]

• Add activity feed API #789 👈 (View in Graphite)
• master

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[github-actions]

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MCK 1.7.1 Release Notes

Other Changes

• Container images: Merged the init-database and init-appdb init container images into a single init-database image. The init-appdb image will no longer be published and does not affect existing deployments.