Create PWA Install callback

This CL creates the callback associated with the PWA Install page
actions. As seen in [1], the callback for this page action is defined in
the OnExecute method [2] since the current implementation uses no
CommandId.

This is a first step in the migration of that page action. On a
follow-up CL, the callback will be used to create an ActionItem in
browser_actions [3].

[1]
https://docs.google.com/document/d/1wq9iXFV2jjsgX2WkS52BQ9E84uqcdlaDMMj4LNQuo0s/edit?tab=t.0#bookmark=id.f5exvecpq14y
[2]
https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ui/views/page_action/pwa_install_view.cc;l=203-224;drc=a48632411d7e7263e8fd4d273d24a80f668b73ec
[3]
https://source.chromium.org/chromium/chromium/src/+/main:chrome/browser/ui/browser_actions.cc;l=156;drc=4ab8f6b03230ecfe44eab58069bac992d0dca80e

Bug: 376283433
Change-Id: I8deef2ee528ae16be7346782e41dc078bea22160
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6204121
Reviewed-by: Caroline Rising <corising@chromium.org>
Reviewed-by: David Pennington <dpenning@chromium.org>
Commit-Queue: André Bianchessi <abianchessi@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1413533}