Print Preview: Remove cloud print code - part 1 (cloud print interface)

Removing cloud print interface, user manager and references.

Note: This is not a full cleanup, as code handling only cloud printers
and account UI still needs to be removed in followups.

Bug: 1162164
Change-Id: I6f33026ca11b1fd31fc7555d32d5661ddeac0fc2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3551728
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/main@{#988775}