Enhancement: Scroll to selected item in Dropdown and Multi-select

Current Behavior

• Dropdowns always open from the top.
• Selected items may be out of view in large lists.

New Behavior

• Single-select dropdown scrolls to the selected option when opened.
• Multi-select dropdown scrolls to the first selected option when opened.
• Applied behavior to both dropdown and multi-select columns in table components.

Implementation

• Used virtualizer.scrollToIndex(firstSelectedIndex, { align: 'center' }) to scroll to the selected option.
• Scroll is triggered only when the menu opens to avoid unexpected jumps during selection changes.
• Logic safely handles both single-select and multi-select cases.

Testing

• Tested with small and large option lists.
• Verified behavior for Single-select dropdown, Multi-select dropdown, Table column dropdowns and multi-selects

Notes

This PR is created from the lts-3.16 branch as requested.

Issue Reference

Fixes #14770