fix(extra-info): show extra info in the RCE thread page

The extra info feature worked with the old thread pages. This CL brings
support to the new RCE thread pages.

Bug: twpowertools:93
Change-Id: I47e4235afa4f7ec441f5a92edfcc28b1cb5f0419
diff --git a/src/models/Message.js b/src/models/Message.js
index 05dc795..0e9d6fb 100644
--- a/src/models/Message.js
+++ b/src/models/Message.js
@@ -76,6 +76,10 @@
     return this.data[5]?.[1] ?? null;
   }
 
+  getEndPendingStateTimestampMicros() {
+    return this.data[1]?.[17] ?? null;
+  }
+
   isTakenDown() {
     return [
       ItemMetadataState.AUTOMATED_ABUSE_TAKE_DOWN_DELETE,