Remove invalid asp-route-returnUrl attribute from Blazor Register template

[Copilot]

The Blazor Register page template contained an invalid asp-route-returnUrl="@ReturnUrl" attribute on the EditForm element. Tag helpers like asp-route-* do not work in Blazor components and this was a copy/paste error from the Razor Pages implementation.

Change Made

- <EditForm Model="Input" asp-route-returnUrl="@ReturnUrl" method="post" OnValidSubmit="RegisterUser" FormName="register">
+ <EditForm Model="Input" method="post" OnValidSubmit="RegisterUser" FormName="register">

Why This Fix is Correct

The ReturnUrl functionality remains completely intact through the proper Blazor mechanisms:

• Parameter capture: [SupplyParameterFromQuery] private string? ReturnUrl { get; set; } properly captures the returnUrl query parameter
• Usage in redirects: ReturnUrl is correctly used in the registration flow:
  • Passed to email confirmation callback URL
  • Passed to RegisterConfirmation page when email confirmation is required
  • Used for direct redirect when no email confirmation is needed

The removed asp-route-returnUrl attribute was non-functional in Blazor components, so removing it has no impact on the actual functionality while cleaning up invalid syntax.

This is a minimal, surgical change affecting only the problematic line.

Fixes #62352.

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[joperezr]

LGTM. Assuming the test failures are unrelated?

[MackinnonBuck]

LGTM. Assuming the test failures are unrelated?

Yes, test failures don't appear related.