Settings: Simplify PasswordCheck{Interaction,Referrer} enum definitions.

Previously these were defined as
PasswordManagerProxy.PasswordCheckInteraction and
PasswordManagerProxy.PasswordCheckReferrer, augmented on the
PasswordManagerProxy class, which is unnecessary and made it harder to
convert to TS.

Also ran clang-format on the JS imports in passwords_section.js

This is in preparation of converting files that use these enums to
TypeScript.

Bug: 1234307
Change-Id: I4567b68febca4dc16436443f7727ff957e575ed5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3138223


Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/main@{#918736}