Fix sticky table header transparency with backdrop-filter blur in dark mode (#23999)

web/app/components/datasets/hit-testing/index.tsx

               <>
                 <div className='grow overflow-y-auto'>
                   <table className={'w-full border-collapse border-0 text-[13px] leading-4 text-text-secondary '}>
-                    <thead className='sticky top-0 h-7 text-xs  font-medium uppercase leading-7 text-text-tertiary'>
+                    <thead className='sticky top-0 h-7 text-xs  font-medium uppercase leading-7 text-text-tertiary backdrop-blur-[5px]'>
                       <tr>
                         <td className='w-[128px] rounded-l-lg bg-background-section-burn pl-3'>{t('datasetHitTesting.table.header.source')}</td>
                         <td className='bg-background-section-burn'>{t('datasetHitTesting.table.header.text')}</td>