Ignore plugins optional deps

[mariusandra]

Changes

• Alternative to Change to @posthog/hot-shots plugin-server#78 (review), this adds --ignore-optional to all yarn install commands running in plugins/

Checklist

• All querysets/queries filter by Organization, by Team, and by User
• Django backend tests
• Jest frontend tests
• Cypress end-to-end tests

[Twixes]

This seems to be the simplest solution, though I don't know where to verify that it actually worked. As in, did this unix-dgram problem appear in CI logs before?

[mariusandra]

This definitely makes the install faster and removes something we don't need.

I started seeing the errors with posthog-plugin-server 0.5.1 that includes hot-shots. The build-essential package was not installed in many environments when yarn install ran, causing it to fail. Since this is just an optional dependency, we never noticed. Adding rdkafka however made the problem visible... and it's now fixed in most places, except for AWS ECS.

So I'm actually not sure if this is even needed. It will make somethings just a bit faster though.

[Twixes]

We can try this out.