Move NotificationOperation and constants to //chrome/common

These are used from //chrome/browser and //chrome/services and should
not be duplicated across them. Move them to a common location instead
and also update the enum naming in the process.

Cleanup CL only, no functional changes.

Bug: None
Change-Id: I7043098e890e937475f5ec2d25412b2c62a16ccf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3115095


Commit-Queue: Richard Knoll <knollr@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Reviewed-by: Rayan Kanso <rayankans@chromium.org>
Cr-Commit-Position: refs/heads/main@{#915144}