fix: use GetByIdAsync in DeleteAsync(TEntityId)

Replaced sync GetById with await GetByIdAsync to avoid blocking the thread inside an async method.

Ref: #IT-631

HrynCo.DAL.EF/Core/BaseEfRepository.cs

@@ -89,7 +89,7 @@ public abstract class BaseEfRepository<TDbContext, TEntity, TEntityId> :
 
     public async Task DeleteAsync(TEntityId id)
     {
-        TEntity? entity = GetById(id);
+        TEntity? entity = await GetByIdAsync(id);
         if (entity != null)
         {
             DoRemove(entity);