feat: add filtering by ServiceName and Key in email templates query and UI

HrynCo.NotificationService.Services/EmailTemplates/GetAll/GetAllEmailTemplatesHandler.cs

@@ -22,7 +22,7 @@ internal sealed class GetAllEmailTemplatesHandler
     protected override async Task<ServiceResult<IReadOnlyList<EmailTemplate>>> DoOnHandle(
         GetAllEmailTemplatesQuery request, CancellationToken cancellationToken)
     {
-        var templates = await _templates.GetAllAsync(cancellationToken);
+        var templates = await _templates.GetAllAsync(request.ServiceName, request.Key, cancellationToken);
         return Success(templates);
     }
 }