feat: Add profile url to user model in databuilder and metadata services

[kristenarmes]

Summary of Changes

This change adds the profile_url field to the user model representations in the databuilder and metadata services. As of today, the profile_url field already exists in the frontend and common user models. With this change, the profile_url will be able to be populated on the backend instead of the only option being to append it later on the frontend.

Tests

I modified any tests that used the User model by passing a profile_url to the constructors.

Documentation

N/A

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