feat(auth): pre-fill email address in org invite registration

[mayuriphad]

Resolves #121594 by properly passing \invite_email\ to the frontend context and pre-filling it on the registration form.

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[github-actions]

🚨 Warning: This pull request contains Frontend and Backend changes!

It's discouraged to make changes to Sentry's Frontend and Backend in a single pull request. The Frontend and Backend are not atomically deployed. If the changes are interdependent of each other, they must be separated into two pull requests and be made forward or backwards compatible, such that the Backend or Frontend can be safely deployed independently.

Have questions? Please ask in the #discuss-dev-infra channel.

[Laithalrubaie]

nice, thanks for picking this up! just a heads up on scope — this touches static/app/views/auth/* (registerForm.tsx, login.tsx), which is only reachable via experimentalSpaRoutes in router/routes.tsx, gated behind EXPERIMENTAL_SPA. that flag's only ever set for pnpm run dev-ui (frontend-only local dev), so it doesn't run on real sentry.io. prod's /auth/register/ is still server-rendered by AuthLoginView + sentry/login.html, so this diff won't reach actual users yet.

also, since it's just initialData.username, the field stays fully editable rather than locked to the invite — might be worth tightening up too, no big deal either way.

I put up a fix for the prod path here if it's useful as a reference: #122430 (+ #122431 for the accept-invite screen itself). Happy to help however's useful!