Plugin upgrades

[mariusandra]

Changes

• Adds a button "Check for upgrades" that checks each plugin if it's the latest github commit / gitlab commit / npm version. If not, you can click to update.
  

• If there's an error connecting to the backend (e.g. github api key limit exceeded, happens often), we show an error:
  

• If a plugin is enabled, we update it, and afterwards there's a new required field, we directly open the config editor:
  

Checklist

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

[timgl]

I think it'd be cool to just run this whenever the page loads rather than on the button click. Much higher chance people will see & actually update

[Twixes]

100% should run automatically (though not more often than x amount of time).

[mariusandra]

The plugins will now check for updates when the page opens. More specifically, I set it to cache the "latest_tag" for each plugin for 30min (with postgres) and it'll only check on page load if the status isn't stale. Clicking on the "check for updates" button checks all plugins.

Currently clicking "check for all updates" tends to exhaust the github api limit quite quickly. This will be fixed when #3070 lands.

[Twixes]

Nice