fix: Remove user.permissions, resolve it from accounts (#9990)

Remove the `user.permissions` field and resolve the permissions directly
from the accounts array in the user. This change ensures that the cache
or previous values from the last active account don't affect the
permissions.

In this PR: 
- Remove user.permissions usage, replace it with getUserPermissions
method.
- Remove json.permissions from user.json.jbuilder

app/javascript/dashboard/helper/permissionsHelper.js

@@ -7,6 +7,15 @@ export const hasPermissions = (
   );
 };
 
+export const getCurrentAccount = ({ accounts } = {}, accountId = null) => {
+  return accounts.find(account => Number(account.id) === Number(accountId));
+};
+
+export const getUserPermissions = (user, accountId) => {
+  const currentAccount = getCurrentAccount(user, accountId) || {};
+  return currentAccount.permissions || [];
+};
+
 const isPermissionsPresentInRoute = route =>
   route.meta && route.meta.permissions;