Cleanup unused Javascript (#3027)

* chore(js): be stricter about dead code warnings

* chore(js): remove dead code and unused exports

* rebase

* chore: remove unused files

* chore(deps): remove unused prop-types dep

* chore(js): remove unused function

* chore(deps): remove + check unused deps

* chore(js): remove unused exports. Closes #3036

web/utils/alert-message-context.tsx

@@ -2,8 +2,7 @@ import React, { useState, FC, ReactElement } from 'react';
 
 export const AlertMessageContext = React.createContext({
   message: null,
-  // eslint-disable-next-line @typescript-eslint/no-unused-vars
-  setMessage: (text?: string) => null,
+  setMessage: (_text?: string) => null,
 });
 
 export type AlertMessageProviderProps = {