[iOS] Add Price Tracking Feature Detection to Page Action Menu.

Implements availability detection for price tracking feature rows.
Checks ContextualPanelTabHelper's cached configurations to determine
if price insights data exists for the current page. Row appears when
the price insights badge would appear in the location bar.

Bug: 450352035
Change-Id: Idca9c2ca4cc8d56bae3f090d6eb2c9721efa54e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7026676
Reviewed-by: Adam Arcaro <adamta@google.com>
Commit-Queue: Ibrahim Kanouche <kanouche@google.com>
Cr-Commit-Position: refs/heads/main@{#1528070}