Create T-all zulip user group

This is needed to configure the infra announcement channel so the zulip
user group membership is synced automatically with project team
membership.

This notably does not include working groups, project groups, or marker
teams.

Author: jieyouxu

teams/all.toml

@@ -28,3 +28,17 @@ include-team-members = false
 extra-emails = [
     "rust-verification@googlegroups.com",
 ]
+
+[[zulip-groups]]
+name = "T-all"
+# Exclude the following people from the Zulip group for grandfathering purposes,
+# where previously we didn't require all project team members to have Zulip IDs
+# (since there wasn't a `T-all` Zulip group previously).
+excluded-people = [
+    "U007D",
+    "andrewpollack",
+    "arshiamufti",
+    "bnchi",
+    "celaus",
+    "opeolluwa",
+]