refactor: align ChromeTargetManager with Puppeteer PR #14602

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Ports refactoring changes from puppeteer/puppeteer#14602 to improve code organization and maintainability in ChromeTargetManager.

Changes

• Extract SilentDetachAsync as class method - Promotes local function to reusable method for better code organization
• Add GetParentTarget helper - Centralizes parent target extraction with proper CdpTarget casting
• Refine service worker destruction logic - Separates type check from attachment check for clarity
• Improve type handling in OnDetachedFromTarget - Uses pattern matching instead of null-conditional casting
• Adjust filtered target initialization - When filtering targets with Tab parents, call FinishInitializationIfReady on the parent's ID instead of the filtered target's ID

Behavior Change

The target filter logic now only marks parent Tab targets as initialized when child targets are filtered, rather than marking the filtered target itself. This better reflects the initialization state of the target hierarchy.

// Before
if (_targetFilterFunc?.Invoke(target) == false)
{
    FinishInitializationIfReady(targetInfo.TargetId);
}

// After  
if (_targetFilterFunc?.Invoke(target) == false)
{
    if (parentTarget?.TargetInfo.Type == TargetType.Tab)
    {
        FinishInitializationIfReady(parentTarget.TargetId);
    }
}

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Pull request overview

This PR ports refactoring changes from puppeteer/puppeteer#14602 to improve code organization and maintainability in the ChromeTargetManager class.

Changes:

• Extracts SilentDetachAsync as a reusable class method and adds GetParentTarget helper for cleaner code organization
• Refines service worker destruction logic by separating type checking from attachment checking for better clarity
• Improves pattern matching in OnDetachedFromTarget for more explicit control flow
• Adjusts filtered target initialization to mark parent Tab targets as initialized instead of filtered targets, better reflecting target hierarchy initialization state

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These 'if' statements can be combined.