Fix Mandatory Re-auth MacOS and iOS Strings

This CL fixes the strings on MacOS for mandatory re-auth. The MacOS
operating system appends periods to the end of the string in addition to
prepending "Google Chrome is trying to" before the string. The
prepending was handled correctly, but due to the fact that there was a
period already in the string, we ended up having two periods.

Here is an example of a prompt with two periods:
https://screenshot.googleplex.com/AjMJGEpnmMTECeV

This CL removes the periods at the end for MacOS, and also moves all of
the strings into the common components/autofill_payments_strings.grdp
file. This is okay because we do not need to differentiate between
Chromium and Google Chrome for these strings on MacOS, that is
automatically handled.

This CL also updates the iOS string to say "Chrome" instead of "Google
Chrome", and the corresponding translation screenshot.

Bug: 1427216
Change-Id: Ia3e7f1382e8fc8c20fbca4547c60c0560077f7d5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5035006
Commit-Queue: Vinny Persky <vinnypersky@google.com>
Reviewed-by: Colin Blundell <blundell@chromium.org>
Reviewed-by: Siyu An <siyua@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1226312}