Confirm dialog for large groups in reviewer flow

This dialog matches the same confirm flow in the reply-dialog.

https://imgur.com/a/al7n41m

Release-Notes: skip
Change-Id: I11273b3872dada2fade2d7be822627c1c01c40f9
diff --git a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
index 6a9bd92..3fd7c89 100644
--- a/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
+++ b/polygerrit-ui/app/elements/change/gr-reply-dialog/gr-reply-dialog.ts
@@ -1276,6 +1276,8 @@
     return selectorEl?.selectedValue;
   }
 
+  // TODO: Combine logic into handleReviewersChanged & handleCCsChanged and
+  // remove account-added event from GrAccountList.
   accountAdded(e: CustomEvent<AccountInputDetail>) {
     const account = e.detail.account;
     const key = accountOrGroupKey(account);