Implemented missing methods in the SaveChangesInterceptorAggregator

[matheus-inacio]

Closes #31361

Description

When more then one interceptor is registered for a DBContext, the AggregateInterceptors method from the InterceptorAggregator class, creates an InterceptorAggregator by calling CreateChain.

efcore/src/EFCore/Diagnostics/InterceptorAggregator.cs

Lines 48 to 58 in d0e0824

	else if (interceptors.Count > 1)
	{
	var filtered = interceptors.OfType<TInterceptor>().ToList();
	if (filtered.Count == 1)
	{
	_interceptor = filtered[0];
	}
	else if (filtered.Count > 1)
	{
	_interceptor = CreateChain(filtered);

Then when triggering the interceptor, the SaveChangesInterceptorAggregator is triggered.

efcore/src/EFCore/Diagnostics/CoreLoggerExtensions.cs

Lines 265 to 268 in d0e0824

	if (interceptor != null)
	{
	return interceptor.ThrowingConcurrencyException(eventData, default);
	}

Since SaveChangesInterceptorAggregator does not implement the methods ThrowingConcurrencyException and ThrowingConcurrencyExceptionAsync from the ISaveChangesInterceptor, therefore no interceptor in the aggregator is notified.

[ajcvickers]

Thanks!