fix: add animation to workflow process loader icon (#15497)

web/app/components/base/chat/chat/answer/workflow-process.tsx

       >
         {
           running && (
-            <RiLoader2Line className='shrink-0 mr-1 w-3.5 h-3.5 text-text-tertiary' />
+            <RiLoader2Line className='shrink-0 mr-1 w-3.5 h-3.5 animate-spin text-text-tertiary' />
           )
         }
         {