Mark LogProcess property as obsolete

[Copilot]

LaunchOptions.LogProcess is set in one location but never used. No equivalent exists in upstream Puppeteer. Maintainer confirmed it's "old debugging stuff."

Changes

• LaunchOptions.cs: Added [Obsolete] attribute with deprecation message
• TestConstants.cs: Removed LogProcess = true assignment
• .gitignore: Added .nuget/ to prevent build artifact commits

Impact

Existing code continues to compile with a compiler warning. Property can be removed in a future major version.

var options = new LaunchOptions 
{
    LogProcess = true  // Warning CS0618: 'LaunchOptions.LogProcess' is obsolete: 
                       // 'This property has no effect and will be removed in a future version.'
};

Original prompt

---

This section details on the original issue you should resolve

<issue_title>LaunchOptions.LogProcess doesn't do anything</issue_title>
<issue_description>LogProcess is only set in a single place in the code base, never used, and setting it in user code doesn't seem to do anything.
It should either be deprecated / removed, or implemented according to its description, as it would be a useful feature (for both browsers). It doesn't seem to have an equivalent in upstream Puppeteer.

puppeteer-sharp/lib/PuppeteerSharp/LaunchOptions.cs

Lines 94 to 97 in de7b94c

	/// <summary>
	/// Logs process counts after launching chrome and after exiting.
	/// </summary>
	public bool LogProcess { get; set; }

Also looking at the class' code, properties and the class itself should clarify which options are Chrome/Firefox-only or affect both.</issue_description>

Comments on the Issue (you are @copilot in this section)

@kblok That's true! Old debugging stuff

Custom agent used: Bidi migration
Implement bidi code

• Fixes LaunchOptions.LogProcess doesn't do anything #3012

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[Copilot]

Pull request overview

This PR removes the unused LogProcess property from LaunchOptions by marking it as obsolete. The property was only set in test code but never actually used, and has no equivalent in upstream Puppeteer.

• Marked LogProcess property as [Obsolete] with a clear deprecation message
• Removed the LogProcess = true assignment from test configuration

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
lib/PuppeteerSharp/LaunchOptions.cs	Added [Obsolete] attribute and remarks to LogProcess property to indicate it has no effect
lib/PuppeteerSharp.Tests/TestConstants.cs	Removed the unused LogProcess = true setting from DefaultBrowserOptions()
.gitignore	Added .nuget/ directory to ignore list (appears unrelated to PR purpose)

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