fix: search error in filter & sort dropdowns

[harshrajeevsingh]

Fixes: #8483

[greptile-apps]

PR Summary

This PR fixes a DOM manipulation error in the dropdown search functionality by consolidating menu items into a single container structure.

• Modified ObjectFilterDropdownFilterSelect.tsx to prevent 'removeChild' error by unifying dropdown menu items under one container
• Updated ObjectSortDropdownButton.tsx to consolidate visible/hidden columns rendering within a single DropdownMenuItemsContainer
• Simplified dropdown structure while maintaining filter/sort functionality and visible/hidden column separation
• Added DropdownMenuSeparator inside the unified container instead of between separate containers

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[github-actions]

Thanks @harshrajeevsingh for your contribution!
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