[Dashboard] Fix: Display latest value in PayNewCustomers component (#7002)

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## PR-Codex overview
This PR focuses on improving the logic used to display the total value in the `SkeletonContainer` of the `PayNewCustomers` component. It ensures that when `graphData` is empty, it returns "NA", and otherwise, it retrieves the last value or defaults to 0.

### Detailed summary
- Updated the logic in `SkeletonContainer`:
  - Changed the expression to return `graphData[graphData.length - 1]?.value || 0` when `graphData` is not empty.
  - Maintained the output of "NA" when `isEmpty` is true.

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Author: gregfromstl

apps/dashboard/src/components/pay/PayAnalytics/components/PayNewCustomers.tsx

@@ -74,9 +74,7 @@ export function PayNewCustomers(props: {
           <div className="mb-5 flex items-center gap-3">
             <SkeletonContainer
               loadedData={
-                isEmpty
-                  ? "NA"
-                  : graphData.reduce((acc, curr) => acc + curr.value, 0)
+                isEmpty ? "NA" : graphData[graphData.length - 1]?.value || 0
               }
               skeletonData={100}
               render={(v) => {