[5.2][Fix] Favourites not showing when home button is pressed in browser tab menu

[Fatxx]

Description

Fix no favourites shown when "home" is pressed in the browser, scripts are now guaranteed to be present when the website is loaded.

This is blocked by MetaMask/dapps#122 and should be tested and merged together.

How to test

• Make sure you check out both branches (app and dapp repo);
• On this line the URL should match your app local URL either http://localhost:3000/ or http://${your-ip}:3000/
• Also on this line it should be changed accordingly like localhost:3000 or {your-ip}:3000

Checklist

• There is a related GitHub issue
• Tests are included if applicable
• Any added code is fully documented

Issue

Progresses #3331

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[andrepimenta]

We probably need to check if the user is on the homepage before we inject the favourites otherwise we will inject them into all websites. Does it need to be on RPCMethods?

[Fatxx]

It should only inject on the "metamask dapps web app" since the event is triggered from there.

Maybe not I just used the RpcMethod logic because we were already using it for other events but we can create a custom event for that.

[andrepimenta]

LGTM!

[chrisleewilcox]

iOS 15.0 Simulator = Pass
iOS 15.5 iPhone 12 = Pass
Android 10 Pixel 3 Simulator = Pass
Android 12 Samsung A42 = Pass

Browser Favorites
Tap Home button shows Favorites = Pass
New Browser Tab show Favorites = Pass
Delete Favorites = Pass