fix(nms): Show an error message if the user login fails

[sebathomas]

Summary

Before this change, the user got no feedback if they typed a wrong password.

NMS already recognized invalid logins via a query parameter, and there was an error property in the login form, the two features were just not put together.

Fixes #13429.

Test Plan

Started NMS locally and entered a wrong password.

Additional Information

• This change is backwards-breaking

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dp-workflow

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nms-workflow

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Results for commit b86fdcc.