Move Pwa Install code outside page_action/

As mentioned here [1], page actions feature code (i.e. callbacks
associated with a page action and implementations that request page
actions to be displayed/hidden) should live outside of the page_actions
framework directory.

This CL simply moves the code created at [2] to a different directory.

[1]
https://chromium-review.googlesource.com/c/chromium/src/+/6204121/comments/d7a91a5f_24d4faa5
[2] https://chromium-review.googlesource.com/c/chromium/src/+/6204121

Bug: 376283433
Change-Id: Iacfb2e0c4e8e9d52e8e575e3d288fabcda609e4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6219627
Reviewed-by: Kaan Alsan <alsan@chromium.org>
Commit-Queue: André Bianchessi <abianchessi@chromium.org>
Reviewed-by: Eshwar Stalin <estalin@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1418737}