Trigger save/update bubble after the leak check is closed

- Introduces GetPasswordsLeakDialogDelegate method in
PasswordsModelDelegate.
- PasswordChangeCredentialLeakBubbleController calls OnLeakDialogHidden
to trigger the save/update password bubble (if needed).
- OnLeakDialogHidden cannot be triggered directly in the Cancel method
because at that moment PasswordChangeService will still hold grip on the
PasswordChangeDelegate and so the ManagePasswordsUIController will be in
the PASSWORD_CHANGE_STATE.

Bug: 392024886
Change-Id: I7e57d468956c8d241f020e94fcfecd6b1992ba24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6198339
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Commit-Queue: Anna Tsvirchkova <atsvirchkova@google.com>
Cr-Commit-Position: refs/heads/main@{#1412385}