Add 'Take SG to your [code host]' popup after clicking 'open on [code host]

Created by: AlicjaSuska

Part of RFC 221: Improve discoverability/awareness of the browser extension

Description

After the user clicks on the 'Open on [code host]' button, a popup should be displayed
It promotes the browser extension in context

Design documentation

View in Figma - light mode and dark mode

popup is displayed only for users who don't have the extension installed
it is displayed for both cloud and private instance users, for all code hosts
user can dismiss the popup using one of 3 buttons: 'no thanks' - go to the code host, never show the popup again 'remind me later' - go to the code host, show the popup next time user clicks on the 'Open on [code host]' button 'Install browser extension' - go to extension installation page in Chrome Web Store or Firefox Add-ons

code host name in the copy changes depending on the code host
code host icon in the graphics depends on the code host See all popup variants
important: GitHub, GitLab, and Bitbucket logos are available as standard icons from the set. Phabricator is a custom icon available in Figma for download