/user/subscription/thank-you
* [web] Initialize BS5 in subscription page * [web] Backend wiring for `user/subscription/thank-you` to BS5 * [web] Update `SuccessfulSubscription` to BS5 GitOrigin-RevId: 45162664c116eb04b73e16443c84fa24ea8b220c
[web] Successful subscription react migration GitOrigin-RevId: 1d7d849415f4b7a7f60ddf8a4e18570ff5142196
[web] React subscription split test GitOrigin-RevId: 6656b3895030bc677483a3e30d5e998f5f7d1458