Rewrite all Companion validation errors to respond with a status code and message

[mifi]

Initial checklist

• I understand this is a feature request and questions should be posted in the Community Forum
• I searched issues and couldn’t find anything (or linked relevant results below)

Problem

When a

for example if COMPANION_AWS_BUCKET is not set, but someone tries to use Uppy S3 plugin against Companion, it will cause an error in the log file, which might trigger a false alarm in ops:

[error] c48cc354 uploader.error TypeError: s3: bucket key must be a string or a function resolving the bucket string

Solution

It was suggested that we should instead respond to the HTTP request with a status code (4xx?) with a message (and not log it as a TypeError)

Alternatives

leave it as is

Kind of related #4762 #4079