Fix Credo Readability (strict)

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

lib/accounts/user/validations/oidc_email_collision.ex

@@ -164,7 +164,7 @@ defmodule Mv.Accounts.User.Validations.OidcEmailCollision do
   end
 
   @impl true
-  def atomic?(), do: false
+  def atomic?, do: false
 
   @impl true
   def describe(_opts) do