chore: Use FlowRoute through a facade (#29507)

apps/meteor/app/analytics/client/index.ts

apps/meteor/app/analytics/client/loadScript.ts

apps/meteor/app/analytics/client/trackEvents.js

apps/meteor/app/mail-messages/server/functions/sendMail.ts

.../meteor/app/message-mark-as-unread/client/actionButton.ts

apps/meteor/app/slashcommands-open/client/client.ts

apps/meteor/app/threads/client/flextab/threadlist.tsx

.../meteor/app/threads/client/messageAction/replyInThread.ts

apps/meteor/app/ui-message/client/ActionManager.js

apps/meteor/app/ui-utils/client/lib/AccountBox.ts

apps/meteor/app/ui-utils/client/lib/LegacyRoomManager.ts

apps/meteor/app/ui-utils/client/lib/messageActionDefault.ts

apps/meteor/app/ui-utils/client/lib/readMessages.ts

apps/meteor/app/ui/client/lib/KonchatNotification.ts

apps/meteor/client/components/GazzodownText.tsx

apps/meteor/client/components/NotFoundState.tsx

...eteor/client/components/Sidebar/SidebarItemsAssembler.tsx

...eteor/client/components/Sidebar/SidebarNavigationItem.tsx

apps/meteor/client/hooks/useAnalyticsEventTracking.ts

apps/meteor/client/hooks/useDefaultRoute.ts