refactor: 'less' notification viewing logic

[LangLangBart]

description

• less scrolls to the bottom of the page using the +G flag for Issues/Pull Requests with at least one comment

• minimize duplication for gh api calls with a gh_rest_api function

• style change by using [[ … ]] over [ … ]

• on 31/May/24 I noticed for the first time ever, that the .updated_at field was null for a notification, applied a fix to it