Prohibit "JSON.stringify(error)"

Frequently we see errors logged in the notifications bad that look like `"{}"`. This is because we are using `JSON.stringify(error)` in many places. Instances of `Error` have no enumerable properties which is the reason for this behavior. We should add a custom linting rule or type changes to prohibit using `JSON.stringify(error)`.

The issue names no files or tests; start by locating the many JSON.stringify(error) usages described in the repository, including those producing "{}" in the notifications bar. Decide whether a custom linting rule or type changes best prohibits the pattern, and consider the work done when such usage is prevented.

Written by the indexing model from the issue text.