[Password manager] Record UKMs when user trigger password change

UKMs can be recorded when web content exists. Once user trigger manual
password change we pass user's intent via intent parameters. When tab
and web content is created we record UKM.

UKM collection review doc: https://docs.google.com/document/d/1DEd-Q4O4FRGdO8Gj2lKw259xes29hHSrGAgJEbJHJpg/edit?resourcekey=0-D0OnMfeMj3uOgheLfNS64Q

Bug:1280581

Change-Id: I06be4261c91d024008597e8b684fad112bd50c99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3361047
Reviewed-by: Ioana Pandele <ioanap@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Milica Selakovic <selakovic@google.com>
Cr-Commit-Position: refs/heads/main@{#960473}