UpdateNet6FileUploadReadAsyncIssue

Update Blazor project to Net 6 from Net 5, IBrowerFile's ReadAsync cannot read all bytes (reported dotnet/aspnetcore#38842). .Net 6 ReadAsync function reads the random number of data and not like in .Net 5, specific amount, a workaround code for .NET 6:

        var buf = new byte[file.Size];
        using var readStream = file.OpenReadStream(maxFileSize);
        var bytesRead = 0;
        var totalRead = 0;
        var buffer = new byte[1024 * 10];

        while ((bytesRead = await readStream.ReadAsync(buffer)) != 0)
        {
            Array.Copy(buffer, 0, buf, totalRead, bytesRead);
            totalRead += bytesRead;
        }