fix: incorrect error message key "error" instead of "message"

[fn-faisal]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

The Parse Server should return consistent error messages.

Approach

Update the error response to share the format code and message.

Note

Making the error message consistent would cause breaks in the existing SDKs. I've opened this PR with the basic idea and maybe a workaround can be added for existing users but locally, this already breaks the dashboard which uses the JS SDK.

[mtrezza]

@fn-faisal Could you open an issue for this? I think this is a breaking change that can better be discussed in an issue. Actually there may be an existing issue for this, I remember this has been discussed recently.

[parse-github-assistant]

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