[Web + Doc-Updater] Add track changes accepted notification (#32752)

* feat: update doc manager to return a list of contributors to the accepted change

* feat: add new notification type for accepting a tracked change

* update email with tracked changes accepted

* feat: update tests

* fix: feedback on consistent api and returns

* feat: adding new tests

* feat: self accepted changes shouldnt trigger notification, and using existing changesAccepted hook

* Add better subject and activity list for track change accepted (#33094)

* feat: add better activity list entry and subject header for accepted changes, to match other notifications

* feat: updating tests

* feat: updating accepting_user_id to just user_id

* fix: adding users in emailBuilder test to userCache

GitOrigin-RevId: 6114f77916b5f503b7bbbb5ca8fed99e58edc31b

services/document-updater/app/js/HttpController.js

@@ -355,17 +355,19 @@ async function acceptChanges(req, res) {
     `accepting ${changeIds.length} changes via http`
   )
   const timer = new Metrics.Timer('http.acceptChanges')
-  await DocumentManager.promises.acceptChangesWithLock(
-    projectId,
-    docId,
-    changeIds
-  )
+  const changeContributors =
+    await DocumentManager.promises.acceptChangesWithLock(
+      projectId,
+      docId,
+      changeIds
+    )
   timer.done()
   logger.debug(
     { projectId, docId },
     `accepted ${changeIds.length} changes via http`
   )
-  res.sendStatus(204) // No Content
+
+  res.status(200).json({ changeContributors })
 }
 
 async function rejectChanges(req, res) {