Resolve groups v2-related TODOs.

Signal/src/ViewControllers/HomeView/ConversationListViewController.m

@@ -1600,6 +1600,7 @@ NSString *const kArchiveButtonPseudoGroup = @"kArchiveButtonPseudoGroup";
         [self.conversationSplitViewController closeSelectedConversationAnimated:YES];
     }
 
+    // GroupsV2 TODO: Should we leave v2 groups here?
     [self.databaseStorage writeWithBlock:^(SDSAnyWriteTransaction *transaction) {
         if ([thread isKindOfClass:[TSGroupThread class]]) {
             TSGroupThread *groupThread = (TSGroupThread *)thread;

SignalMessaging/groups/GroupV2UpdatesImpl.swift

@@ -292,6 +292,7 @@ public class GroupV2UpdatesImpl: NSObject, GroupV2UpdatesSwift {
                                                               groupUpdateMode: groupUpdateMode)
                 .recover { (error) throws -> Promise<TSGroupThread> in
                     let shouldTrySnapshot = { () -> Bool in
+                        // This should not fail over in the case of networking problems.
                         if IsNetworkConnectivityFailure(error) {
                             Logger.warn("Error: \(error)")
                             return false