[Statsig] Sample noisy events (#4288)

* Sample state:background and state:foreground

* Sample feed events

* Add DEV protection against forgetting to add events to the list

src/view/com/feeds/FeedPage.tsx

@@ -76,7 +76,7 @@ export function FeedPage({
       scrollToTop()
       truncateAndInvalidate(queryClient, FEED_RQKEY(feed))
       setHasNew(false)
-      logEvent('feed:refresh', {
+      logEvent('feed:refresh:sampled', {
         feedType: feed.split('|')[0],
         feedUrl: feed,
         reason: 'soft-reset',
@@ -102,7 +102,7 @@ export function FeedPage({
     scrollToTop()
     truncateAndInvalidate(queryClient, FEED_RQKEY(feed))
     setHasNew(false)
-    logEvent('feed:refresh', {
+    logEvent('feed:refresh:sampled', {
       feedType: feed.split('|')[0],
       feedUrl: feed,
       reason: 'load-latest',