CORE-1383: Store self-reported school from signup and display it in profile

[RoyEJohnson]

CORE-1383

[Copilot]

Pull Request Overview

This PR implements functionality to store the self-reported school field during student signup and display it on the user's profile page.

• Adds a school attribute to the student signup form that maps to the self_reported_school field in the User model
• Displays the self-reported school on the profile page when the value is present
• Adds a translation key for the self-reported school label

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
app/handlers/newflow/student_signup/signup_form.rb	Added school attribute parameter and mapped it to self_reported_school during user creation
app/views/newflow/base/profile_newflow.html.erb	Added conditional display of self-reported school field in the profile view
config/locales/en.yml	Added translation key "self_reported_school" for the profile display label

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