Ensure name is updated after anonymous account linking

[Supereg]

Ensure name is updated after anonymous account linking

:recycle: Current situation & Problem

As described in #35, the displayName is not updated in the signup code path that handles linking signup credentials with an existing anonymous account. This PR fixes this issue by updating the display name of the anonymous account if the signup request provides a display name.

:gear: Release Notes

• Fixed an issue where the displayName was not updated when signing in by linking against an anonymous user account.

:books: Documentation

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:white_check_mark: Testing

A regression test was added that verifies this behavior.

:pencil: Code of Conduct & Contributing Guidelines

By submitting creating this pull request, you agree to follow our Code of Conduct and Contributing Guidelines:

• [x] I agree to follow the Code of Conduct and Contributing Guidelines.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.39%. Comparing base (f05c859) to head (5618c81).

Additional details and impacted files

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