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

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

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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/HttpTnsuPortalClient.cs

@@ -12,14 +12,16 @@ public sealed class HttpTnsuPortalClient(
 {
     private static readonly JsonSerializerOptions JsonOptions = new() { PropertyNameCaseInsensitive = true };
 
-    public async Task<EmployeeDirectoryInfo?> GetEmployeeByEmailAsync(string email, CancellationToken cancellationToken)
+    public async Task<IReadOnlyList<EmployeeDirectoryInfo>> GetEmployeeByEmailAsync(string email, CancellationToken cancellationToken)
     {
-        var employee = await GetAsync<EmployeeResponse>(
+        var employees = await GetAsync<List<EmployeeResponse>>(
             $"/Employee/ByEmail?email={Uri.EscapeDataString(email)}", cancellationToken);
-        if (employee is null)
-            return null;
+        if (employees is null)
+            return [];
 
-        return new EmployeeDirectoryInfo(employee.CompanyId ?? Guid.Empty, employee.DepartmentId, employee.Company ?? string.Empty, employee.Position);
+        return employees
+            .Select(e => new EmployeeDirectoryInfo(e.CompanyId ?? Guid.Empty, e.DepartmentId, e.Company ?? string.Empty, e.Position))
+            .ToList();
     }
 
     public async Task<EmployeeLookupResult> GetEmployeeByPositionAsync(string position, string company, CancellationToken cancellationToken)