Enable resend_latest on resampled stream channels

Signed-off-by: Sahas Subramanian <[email protected]>

Author: shsms

src/frequenz/sdk/timeseries/formulas/_resampled_stream_fetcher.py

@@ -60,8 +60,12 @@ async def fetch_stream(
             self._metric,
             None,
         )
-        await self._resampler_subscription_sender.send(request)
 
-        return self._channel_registry.get_or_create(
+        chan = self._channel_registry.get_or_create(
             Sample[Quantity], request.get_channel_name()
-        ).new_receiver()
+        )
+        chan.resend_latest = True
+
+        await self._resampler_subscription_sender.send(request)
+
+        return chan.new_receiver()