[CrOS Cellular] Update EID dialog to open from an overflow menu.

Update <cellular-networks-list> to use a triple dot menu to access the
EID dialog rather than info button.

Screenshots:
https://screenshot.googleplex.com/ATHQquwHLgu5YmM.png
https://screenshot.googleplex.com/4pgdq4Trksav9gC.png
https://screenshot.googleplex.com/hY72aNe8w4EWdrx.png
https://screenshot.googleplex.com/Btc7fDDFB2YFwGZ.png

Bug: 1208082
Change-Id: I767b29d63b113160c3fb092db4ddd0a2f2b98053
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2893280


Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Gordon Seto <gordonseto@google.com>
Cr-Commit-Position: refs/heads/master@{#882419}