Username is `undefined` in email verification link on email change

[mtrezza]

New Issue Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.
• I can reproduce the issue with the latest version of Parse Server.

Issue Description

The email verification link is broken due to the value username=undefined within the link. This occurs when changing the email address of a user.

Steps to reproduce

See test in #8887.

Actual Outcome

Username is undefined in link.

Expected Outcome

Username should be defined.

Environment

Server

• Parse Server version: 7.0.0-alpha.6

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[parseplatformorg]

🎉 This change has been released in version 7.0.0-alpha.7

[parseplatformorg]

🎉 This change has been released in version 7.0.0-beta.1

[parseplatformorg]

🎉 This change has been released in version 7.0.0