Add log option for username taken event

[mtrezza]

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New Feature / Enhancement Checklist

• Report security issues confidentially.
• Any contribution is under this license.
• Before posting search existing issues.

Current Limitation

Parse Server logs event when trying to sign up with a username that is already taken. This log event cannot be silenced.

Feature / Enhancement Description

Add a new Parse Server option logEvents.usernameAlreadyExists that allows to customize the log level.

Example Use Case

When trying to create a user with a username that is already taken by another user, this error is logged:

{
    "code": 202,
    "stack": "Error: Account already exists for this username.\n at node_modules/parse-server/lib/RestWrite.js:591:13"
}

References

• https://github.com/parse-community/parse-server/issues/8529