Implement MSC4069: Inhibit profile propagation

[turt2live]

MSC: matrix-org/matrix-spec-proposals#4069

Pull Request Checklist

• Pull request is based on the develop branch
• Pull request includes a changelog file. The entry should:
  • Be a short description of your change which makes sense to users. "Fixed a bug that prevented receiving messages from other servers." instead of "Moved X method from EventStore to EventWorkerStore.".
  • Use markdown where necessary, mostly for code blocks.
  • End with either a period (.) or an exclamation mark (!).
  • Start with a capital letter.
  • Feel free to credit yourself, by adding a sentence "Contributed by @github_username." or "Contributed by [Your Name]." to the end of the entry.
• Pull request includes a sign off
• Code style is correct
  (run the linters)

[turt2live]

I'm not sure why sytest is failing here. Feels like a flake.

[clokep]

I'm not sure why sytest is failing here. Feels like a flake.

matrix-org/sytest#1201

[erikjohnston]

This looks sane! I haven't done a full nit-picky review yet. Do you want this to land or are you happy having it as a PR as proof of implementation?

[turt2live]

It would be good to land: it's somewhat blocking implementation of MSCs in matrix-media-repo.

[erikjohnston]

Otherwise looks good

[erikjohnston]

Thanks!