[dotnet] ability to create tests using mocked driver

[Indomitable]

User description

I noticed that all tests require real browser driver, but I think it can be useful to have ability to write tests which doesn't need it. We can use WireMock to mock driver responses and write more detailed tests.

It contains a test that tests my changes in PR: #14242

Unfortunately my knowledge with bazel is quite limited in order to add integration for bazel test but for this dotnet test should be sufficient.

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Description

Motivation and Context

Types of changes

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

Checklist

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

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PR Type

Enhancement, Tests

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Description

• Added a new MockWebDriver class to facilitate testing without a real browser driver.
• Implemented tests for MockWebDriver constructor using WireMock to mock server responses.
• Included the new test project WebDriver.Mock.Tests in the solution file.
• Created project file for WebDriver.Mock.Tests with necessary package references.

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Changes walkthrough 📝

	Relevant files
Enhancement	GlobalUsings.cs Add global using directive for NUnit framework                      dotnet/test/mocked/GlobalUsings.cs Added global using directive for NUnit framework. +1/-0      MockWebDriver.cs Implement MockWebDriver class for testing                                dotnet/test/mocked/MockWebDriver.cs Created MockWebDriver class inheriting from OpenQA.Selenium.WebDriver. Implemented constructor to initialize with mocked server. +12/-0
Tests	WebDriverConstructorTests.cs Add tests for MockWebDriver constructor                                    dotnet/test/mocked/WebDriverConstructorTests.cs Added tests for MockWebDriver constructor. Included tests for session creation and error handling. +91/-0
Configuration changes	WebDriver.NET.sln Include MockWebDriver tests project in solution                    dotnet/WebDriver.NET.sln Added WebDriver.Mock.Tests project to solution file. +6/-0      WebDriver.Mock.Tests.csproj Create project file for MockWebDriver tests                            dotnet/test/mocked/WebDriver.Mock.Tests.csproj Created project file for WebDriver.Mock.Tests. Added necessary package references for testing. +28/-0

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