ref(forms): Migrate account security 2FA enrollment off JsonForm to scraps form

[priscilawebdev]

Summary

Migrates the account security 2FA/MFA enrollment form (accountSecurityEnroll.tsx) from the legacy JsonForm/FormModel/sentry/components/forms system to the new scraps form system (@sentry/scraps/form).

Part of the ongoing JsonForm -> scraps form migration.

What changed

• Replaced the single server-driven Form + JsonForm + FormModel with three focused scraps useScrapsForm components — one per authenticator type (TotpEnrollForm, SmsEnrollForm, U2fEnrollForm) — dispatched by authenticator.id.
• All enrollment behavior is preserved:
  • TOTP: QR code, copyable authenticator secret, OTP field, Confirm submit (POST {otp, secret}).
  • SMS: two-step send-code / verify-OTP flow, phone disabling after send, Start Over reset + refetch, loading/success/error toasts, form reset on error.
  • U2F: WebAuthn enrollment + device name field, Confirm submit.
  • Whole-page loading indicator during TOTP/U2F submit, Already enrolled redirect, relocation org-subdomain redirect, remove-authenticator confirm.
• Server-provided field labels/defaults are still read from authenticator.form, so copy is unchanged.
• Refactored WebAuthnEnroll (only consumer is this view) to be form-agnostic: it now reports the attestation result via an onEnroll callback instead of mutating a legacy FormModel.
• Mutations use useMutation + fetchMutation with the mutationFn payload typed (no call-site generics).

Form search

This form is not registered in SettingsSearch (no src/sentry/data/forms entry; fields are server-driven on a dynamic route), so no FormSearch wrapper or field-registry regeneration is needed.

Testing

• pnpm run typecheck (whole project) passes
• pnpm run lint:js passes for changed files
• pnpm test-ci accountSecurityEnroll.spec.tsx passes (5/5)

No customer information is included in this change.

[github-actions]

📊 Type Coverage Diff

Metric	Before	After	Delta
Coverage	93.92%	93.93%	🟢 +0.01%
Typed	134,398	134,433	🟢 +35
Untyped	8,697	8,680	🟢 -17

🔍 2 new type safety issues introduced

any-typed symbols (2 new)

File	Line	Detail
static/app/views/settings/account/accountSecurity/accountSecurityEnroll.tsx	73	label (var)
static/app/views/settings/account/accountSecurity/accountSecurityEnroll.tsx	78	defaultValue (var)

This is informational only and does not block the PR.