Optimize scrolling behavior of Discover table

This is an improvement to opensearch-project#6683

Signed-off-by: Miki <miki@amazon.com>

src/plugins/discover/public/application/components/default_discover_table/default_discover_table.tsx

@@ -180,6 +180,12 @@ const DefaultDiscoverTableUI = ({
     if (tableElement) {
       // Load the first batch of rows and adjust the columns to the contents
       tableElement.style.tableLayout = 'auto';
+      // To prevent influencing the auto-sizing, unset the widths from a previous render
+      tableElement
+        .querySelectorAll('thead > tr > th:not(:first-child):not(:last-child)')
+        .forEach((th) => {
+          (th as HTMLTableCellElement).style.width = 'unset';
+        });
 
       tableLayoutRequestFrameRef.current = requestAnimationFrame(() => {
         if (tableElement) {