Add metrics to track the user's interaction with the mandatory reauth
opt-in bubble.

This CL modifies the MandatoryReauthBubbleControllerImpl such that it
tracks when the user is shown the opt-in bubble and the type of
interaction the user ultimately has with the opt-in bubble. These
metrics, along with the metrics that will be added for the confirmation
view can be utilized to determine the effectiveness of the feature.

Bug: 1427216
Change-Id: Id8d9e24d4cca4fae240f0449450d942efe7c799b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4575044
Reviewed-by: Olivia Saul <jsaul@google.com>
Commit-Queue: Justin Wells <justinleewells@google.com>
Reviewed-by: Christoph Schwering <schwering@google.com>
Reviewed-by: Vinny Persky <vinnypersky@google.com>
Reviewed-by: Peter Boström <pbos@chromium.org>
Code-Coverage: Findit <findit-for-me@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/heads/main@{#1158457}