message: Remove unused recipient_id.

I confirmed this isn't used in any .hbs templates, so
it doesn't seem to be being used anywhere.

tools/zulip-export/zulip-export

@@ -75,7 +75,6 @@ for msg in result["messages"]:
         "edit_history",
         "topic_links",
         "avatar_url",
-        "recipient_id",
         "content_type",
         "client",
         "sender_realm_str",

web/src/message_store.ts

@@ -76,7 +76,6 @@ export const raw_message_schema = z.intersection(
             last_edit_timestamp: z.optional(z.number()),
             last_moved_timestamp: z.optional(z.number()),
             reactions: z.array(message_reaction_schema),
-            recipient_id: z.number(),
             sender_email: z.string(),
             sender_full_name: z.string(),
             sender_id: z.number(),

web/src/recent_view_ui.ts

@@ -615,7 +615,6 @@ type ConversationContext = {
           is_private: true;
           user_ids_string: string;
           rendered_pm_with_html: string;
-          recipient_id: number;
           pm_url: string;
           is_group: boolean;
           is_bot: boolean;
@@ -725,7 +724,6 @@ function format_conversation(conversation_data: ConversationData): ConversationC
                 }),
             )
             .sort();
-        const recipient_id = last_msg.recipient_id;
         const pm_url = last_msg.pm_with_url;
         const is_group = last_msg.display_recipient.length > 2;
         const has_unread_mention =
@@ -764,7 +762,6 @@ function format_conversation(conversation_data: ConversationData): ConversationC
                 "long",
                 "conjunction",
             ),
-            recipient_id,
             pm_url,
             is_group,
             is_bot,

web/src/server_message.ts

@@ -51,7 +51,6 @@ export const server_message_schema = z.intersection(
         last_edit_timestamp: z.optional(z.number()),
         last_moved_timestamp: z.optional(z.number()),
         reactions: message_reaction_schema,
-        recipient_id: z.number(),
         sender_email: z.string(),
         sender_full_name: z.string(),
         sender_id: z.number(),