[PRImpl] Move OnSectionOptionSelected into PaymentUIsManager

Since OnSectionOptionSelected is PaymentRequest UI logic, move it into
PaymentUIsManager.

Bug: 1102522, 1114791

Change-Id: I8268493c6d65ec14aa89444b461910d58c5af4bd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2402119


Commit-Queue: Liquan (Max) Gu <maxlg@chromium.org>
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805890}