[dotnet] Annotate nullability on Target protocol

[RenderMichael]

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Annotate nullability on Target protocol

Motivation and Context

Contributes to #14640

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.

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PR Type

Enhancement

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Description

• Annotated nullability for Target protocol and related classes.

• Added nullability checks and exceptions for constructor parameters.

• Updated method signatures to support nullable parameters.

• Enabled nullable reference types in affected files.

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Changes walkthrough 📝

Relevant files

Enhancement

Target.cs Added nullability annotations to `Target` class                    dotnet/src/webdriver/DevTools/Target.cs Enabled nullable reference types. Updated event handlers to allow nullable types. Adjusted method signatures to support nullable parameters. +6/-4      V130Target.cs Added nullability annotations to `V130Target` class            dotnet/src/webdriver/DevTools/v130/V130Target.cs Enabled nullable reference types. Added nullability checks for constructor parameters. Updated method signatures to support nullable parameters. Simplified null checks in methods. +13/-12  V131Target.cs Added nullability annotations to `V131Target` class            dotnet/src/webdriver/DevTools/v131/V131Target.cs Enabled nullable reference types. Added nullability checks for constructor parameters. Updated method signatures to support nullable parameters. Simplified null checks in methods. +13/-12  V132Target.cs Added nullability annotations to `V132Target` class            dotnet/src/webdriver/DevTools/v132/V132Target.cs Enabled nullable reference types. Added nullability checks for constructor parameters. Updated method signatures to support nullable parameters. Simplified null checks in methods. +13/-12  V85Target.cs Added nullability annotations to `V85Target` class              dotnet/src/webdriver/DevTools/v85/V85Target.cs Enabled nullable reference types. Added nullability checks for constructor parameters. Updated method signatures to support nullable parameters. Simplified null checks in methods. +11/-7

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PR Reviewer Guide 🔍

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⏱️ Estimated effort to review: 2 🔵🔵⚪⚪⚪

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Event Handler Safety The TargetDetached and TargetAttached events are marked as nullable but there are no null checks when raising these events. This could lead to NullReferenceException if handlers are removed. public event EventHandler<TargetDetachedEventArgs>? TargetDetached; /// <summary> /// Occurs when a target is attached. /// </summary> public event EventHandler<TargetAttachedEventArgs>? TargetAttached;

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[RenderMichael]

Failures are unrelated to this PR

//java/test/org/openqa/selenium/mobile:NetworkConnectionTest
//java/test/org/openqa/selenium/remote:RemoteWebDriverScreenshotTest
//java/test/org/openqa/selenium/remote:RemoteWebDriverScreenshotTest-firefox-beta
//rb/spec/integration/selenium/webdriver:network-firefox-beta-bidi
//rb/spec/integration/selenium/webdriver:network-firefox-bidi