proto: Remove UpdateUserPlan message (#36268)

This PR removes the `UpdateUserPlan` RPC message.

We're no longer using the message after
https://github.com/zed-industries/zed/pull/36255.

Release Notes:

- N/A

crates/proto/proto/app.proto

@@ -12,16 +12,6 @@ enum Plan {
     ZedProTrial = 2;
 }
 
-message UpdateUserPlan {
-    Plan plan = 1;
-    optional uint64 trial_started_at = 2;
-    optional bool is_usage_based_billing_enabled = 3;
-    optional SubscriptionUsage usage = 4;
-    optional SubscriptionPeriod subscription_period = 5;
-    optional bool account_too_young = 6;
-    optional bool has_overdue_invoices = 7;
-}
-
 message SubscriptionPeriod {
     uint64 started_at = 1;
     uint64 ended_at = 2;

crates/proto/proto/zed.proto

@@ -135,7 +135,6 @@ message Envelope {
         FollowResponse follow_response = 99;
         UpdateFollowers update_followers = 100;
         Unfollow unfollow = 101;
-        UpdateUserPlan update_user_plan = 234;
         UpdateDiffBases update_diff_bases = 104;
         AcceptTermsOfService accept_terms_of_service = 239;
         AcceptTermsOfServiceResponse accept_terms_of_service_response = 240;
@@ -414,7 +413,7 @@ message Envelope {
     reserved 221;
     reserved 224 to 229;
     reserved 230 to 231;
-    reserved 235 to 236;
+    reserved 234 to 236;
     reserved 246;
     reserved 247 to 254;
     reserved 255 to 256;

crates/proto/src/proto.rs

@@ -275,7 +275,6 @@ messages!(
     (UpdateProject, Foreground),
     (UpdateProjectCollaborator, Foreground),
     (UpdateUserChannels, Foreground),
-    (UpdateUserPlan, Foreground),
     (UpdateWorktree, Foreground),
     (UpdateWorktreeSettings, Foreground),
     (UpdateRepository, Foreground),