Bambusa: Fix or track all pre-existing errors

[chillu]

Overview

This is a follow up on https://github.com/silverstripeltd/open-sourcerers/issues/64, which is:

As a Product Owner, I want to know if users are experiencing errors
on the demo in order to be proactive about ensuring they have a good experience

Ideally we should fix issues before we get notifications about them from users. This card is for ensuring we have all pre-existing errors under control.

Acceptance Criteria

• All errors reported by Raygun are either fixed or tracked on appropriate GitHub repositories.
• All errors either have assignee on Raygun or ignored

Notes

• Our current Raygun settings for Slack enforce it not to repost reoccurring errors, so we need to keep an eye on Raygun UI for that. If we want it to repost an issue, we need to mark it as resolved on Raygun side.