[dotnet] Fix network response data encoding

[nvborisenko]

Description

NetworkManager exposes HTTP response body data as string type. Not all responses have strings. In case if the response is bytes, selenium is doing extra convertion from bytes to utf8 string. It leads to data loosing, we cannot convert string back to bytes.

Motivation and Context

Fix #11726

New approach to get data

network.NetworkResponseReceived += (sender, e) =>
{
    if (e.ResponseResourceType == "Image")
    {
        Console.WriteLine($"{e.ResponseUrl} : {e.ResponseResourceType}");
        if (!string.IsNullOrEmpty(e.ResponseBody))
        {
            Console.WriteLine(Encoding.UTF8.GetBytes(e.ResponseBody).Length);
        }

        if (e.ResponseContent != null)
        {
            Console.WriteLine(e.ResponseContent.ReadAsByteArray().Length);
        }
    }
};

await network.StartMonitoring();

driver.Url = "https://selenium.dev";

And its output is:

https://www.selenium.dev/images/sponsors/saucelabs.png : Image
11191
6255

where 6255 is correct bytes of the image.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[diemol]

Thank you, @nvborisenko!