feat(bulk-report-replies): add feature with non-functional UI

This commit adds a new "bulk report replies" feature along with its UI.
The underlying logic will be implemented soon.

Bug: twpowertools:192
Change-Id: I6a6a636c7186485154c32dbbec001493b3b0458f
diff --git a/src/contentScripts/communityConsole/threadToolbar/constants.js b/src/contentScripts/communityConsole/threadToolbar/constants.js
index 756d880..14f8c24 100644
--- a/src/contentScripts/communityConsole/threadToolbar/constants.js
+++ b/src/contentScripts/communityConsole/threadToolbar/constants.js
@@ -1,5 +1,5 @@
-export const kEventFlattenThreadsUpdated =
-    'TWPTThreadToolbarFlattenThreadsUpdated';
+export const kEventOptionUpdated =
+    'TWPTThreadToolbarOptionUpdated';
 
 export const kRepliesSectionSelector =
     'ec-thread .scTailwindThreadThreadcontentreplies-section';