[dotnet] Address some build warnings

[nvborisenko]

PR Type

Bug fix, Enhancement

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Description

• Removed redundant exception message in Cookie.FromDictionary.

• Added null-forgiving operator to avoid nullable warnings in CookieJar.

• Updated obsolete CodeBase handling in FileUtilities with conditional checks.

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Changes walkthrough 📝

	Relevant files
Bug fix	Cookie.cs Simplified exception handling in `Cookie.FromDictionary`  dotnet/src/webdriver/Cookie.cs Removed redundant exception message in ArgumentNullException. +1/-1
Enhancement	CookieJar.cs Improved nullability handling in `CookieJar`                          dotnet/src/webdriver/CookieJar.cs Added null-forgiving operator to avoid nullable warnings. +1/-1      FileUtilities.cs Updated obsolete `CodeBase` handling in `FileUtilities`    dotnet/src/webdriver/Internal/FileUtilities.cs Added conditional checks for obsolete CodeBase property. Used pragma directives to suppress warnings for obsolete members. +9/-2

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PR Reviewer Guide 🔍

Here are some key observations to aid the review process:

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

🧪 No relevant tests

🔒 No security concerns identified

⚡ Recommended focus areas for review Null Reference The code assumes codeBase is not null when creating the directory path, but there's no fallback if it is null. Consider adding a fallback path. if (codeBase is not null) { currentDirectory = Path.GetDirectoryName(codeBase)!; } Null Handling Using the null-forgiving operator (!) may hide potential null reference issues. Consider adding explicit null checking instead. return Cookie.FromDictionary((Dictionary<string, object>)rawCookie!);

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PR Code Suggestions ✨

Explore these optional code suggestions:

Category	Suggestion	Score
Possible issue	Fix incorrect path parsing Create a new Uri from the codeBase string and use its LocalPath property to get the correct file path, as the raw CodeBase value might contain a URI format. dotnet/src/webdriver/Internal/FileUtilities.cs [199-202] if (codeBase is not null) { - currentDirectory = Path.GetDirectoryName(codeBase)!; + Uri uri = new Uri(codeBase); + currentDirectory = Path.GetDirectoryName(uri.LocalPath)!; } Apply this suggestion Suggestion importance[1-10]: 9 Why: The suggestion correctly identifies a critical issue where direct use of CodeBase without URI parsing could cause path-related bugs, as CodeBase returns a URL format that needs proper conversion via Uri.LocalPath.	9
General	Add descriptive exception message Add a descriptive exception message to help developers understand why the argument is invalid, as removing it makes debugging harder. dotnet/src/webdriver/Cookie.cs [280] -throw new ArgumentNullException(nameof(rawCookie)); +throw new ArgumentNullException(nameof(rawCookie), "Cookie dictionary cannot be null"); Apply this suggestion Suggestion importance[1-10]: 3 Why: While adding a descriptive message could help with debugging, the PR deliberately removes the message to be consistent with standard .NET practices where ArgumentNullException often uses just the parameter name.	3

[RenderMichael]

Nice to see less warnings ✅