[🚀 Feature]: [dotnet] Execute internal unit tests against .NET Framework

[nvborisenko]

Description

For now our tests are targeted to .NET8.0, it is OK. In fact Selenium supports .NET Framework implicitly via netstandard2.0 API definition. But the reality .NET Framework is absolutely different implementation of the API.

Have you considered any alternatives or workarounds?

And we already see this impact: #16091

It is only one obvious issue we could handle before release. There are more many potential issues in network module (CDp/BiDi).

It would be nice if we execute unit tests for .NET Framework too. Hm, 4.6.1 or 4.8?

[selenium-ci]

@nvborisenko, thank you for creating this issue. We will troubleshoot it as soon as we can.

Selenium Triage Team: remember to follow the Triage Guide