refactor: remove firebase isAuthenticated, rename isLoggedIn to isAuthenticated (@copilot)#7738

Copilot wants to merge 2 commits intomastermonkeytypegame/monkeytype:masterfrom

copilot/remove-isauthenticated-rename-isloggedinmonkeytypegame/monkeytype:copilot/remove-isauthenticated-rename-isloggedinCopy head branch name to clipboard