[autofill] Rename PaymentsBubbleClosedReason enum to PaymentsUiClosedReason

The PaymentsBubbleClosedReason will also be used
for Dialog closing as well for various use cases
(most recently to log the correct metrics). This
renaming would make the enum more generic for
these use cases.

Fixed: 40202104
Change-Id: I971fc1a06750f38b27abfcc3f17c0b624fcb1a59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5920303
Reviewed-by: Vishwas Uppoor <vishwasuppoor@google.com>
Reviewed-by: Vinny Persky <vinnypersky@google.com>
Commit-Queue: Ho Cheung <hocheung@chromium.org>
Reviewed-by: Olivia Saul <jsaul@google.com>
Reviewed-by: Christoph Schwering <schwering@google.com>
Reviewed-by: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1369124}