This pull request includes several changes to the PopupService class in the packages/ag-grid-community/src/widgets/popupService.ts file. The main focus of these changes is to improve the accuracy and performance of popup positioning.

Improvements to popup positioning:

• Modified the calculation of initialDiff to use a rounded number for more accurate positioning.
• Replaced the use of setInterval with requestAnimationFrame for updating popup positions, which leverages the monitor's refresh rate for smoother animations.
• Updated the calculation of currentDiff to use a rounded number for consistency with the initialDiff change.
• Removed the setInterval logic and replaced it with requestAnimationFrame to continuously update the popup position, ensuring better performance and responsiveness.