Несколько условий шага, объединяемых через И/ИЛИ (#16)

<html>
<body>
<!--StartFragment-->
GetEmployeeByEmailAsync возвращает массив; новый HeadType.CompanyDirectors
--

<!--EndFragment-->
</body>
</html>[GetEmployeeByEmailAsync возвращает массив; новый HeadType.CompanyDirectors](http://git.tnsu.kz/gorbenko.pavel/tnsu-approval-route/commit/572749b4d7cc11bc8e1ef4184a93f18a14b710ab)

---------

Co-authored-by: gorbenko.pavel <gorbenko.pavel@tansu.kz>
Reviewed-on: http://git.tnsu.kz/gorbenko.pavel/tnsu-approval-route/pulls/16

backend/Tnsu.ApprovalRoute.Infrastructure/TnsuPortal/CachingTnsuPortalClient.cs

@@ -17,7 +17,7 @@ public sealed class CachingTnsuPortalClient(HttpTnsuPortalClient inner, IMemoryC
 {
     private static readonly TimeSpan CacheDuration = TimeSpan.FromMinutes(5);
 
-    public Task<EmployeeDirectoryInfo?> GetEmployeeByEmailAsync(string email, CancellationToken cancellationToken) =>
+    public Task<IReadOnlyList<EmployeeDirectoryInfo>> GetEmployeeByEmailAsync(string email, CancellationToken cancellationToken) =>
         GetOrAddAsync(
             $"emp:email:{email.ToLowerInvariant()}",
             () => inner.GetEmployeeByEmailAsync(email, cancellationToken));