Fix Credo Readability (strict)

- Max line length, implicit try, alias order, zero-arity defs
- String sigils, long comments split; redundant blank lines fixed

test/mv/membership/custom_field_value_policies_test.exs

@@ -9,8 +9,8 @@ defmodule Mv.Membership.CustomFieldValuePoliciesTest do
   # async: false because we need database commits to be visible across queries
   use Mv.DataCase, async: false
 
-  alias Mv.Membership.{CustomField, CustomFieldValue}
   alias Mv.Accounts
+  alias Mv.Membership.{CustomField, CustomFieldValue}
 
   require Ash.Query