AggregateError#message from Issuer.discover includes stack trace

[adamjmcgrath]

Description

One of the errors thrown by Issuer.discover is an AggregateError, which encapsulates all the errors thrown when the openid-client tries to find a well-known endpoint.

The error.message of the AggregateError includes a \n separated string of a list of the entire errors (String(error)) - stack trace included (See https://github.com/sindresorhus/aggregate-error/blob/v3.1.0/index.js#L26-L31)

In production we don't want to show the stack trace, so the error message in this case needs to be amended. Instead of trying to edit the error message, we're opting for showing the first error in the aggregate, on the assumption that, if all the discovery endpoints fail, the error will be similar for all.

In the long term we should try and fix this in the downstream dependency openid-client > p-any > p-some > aggregate-error

References

sindresorhus/aggregate-error#4 (comment)

Testing

• Point issuerBaseURL at an https server with invalid certs
• Visit Login

Before

After

• This change adds test coverage for new/changed/fixed functionality

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not master

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