fixes tooltip always staying on top

[Hirogen]

This pull request primarily focuses on simplifying and modernizing delegate usage in the LogTabWindow class, as well as making small improvements to tooltip behavior in the UI controls. The most significant changes are the removal of explicit delegate type declarations in favor of direct method references, which results in cleaner and more maintainable code. Additionally, there are minor improvements to tooltip display timing and the removal of a documentation file.

Delegate and Event Handling Modernization:

• Removed explicit delegate type declarations (e.g., SetTabIconDelegate, AddFileTabsDelegate, etc.) in LogTabWindow.cs, replacing them with direct method references in BeginInvoke and Invoke calls. This modernizes the code and reduces redundancy. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]
• Updated the HighlightSettingsChanged event to use the standard EventHandler delegate instead of a custom one, improving consistency with .NET conventions.
• Replaced the use of a custom delegate for background exception throwing with Task.Run, aligning with modern asynchronous programming patterns.

UI/UX Improvements:

• Set the AutoPopDelay property to 5000 ms (5 seconds) for tooltips in both LogWindow and TimeSpreadingControl, ensuring a consistent and user-friendly tooltip display duration. [1] [2]

Documentation Cleanup:

• Removed the PIPELINES_IMPLEMENTATION_STRATEGY.md documentation file, because it is no longer relevant.