fix(trogon-source-discord): skip dedup for member/ban lifecycle events

These events lack unique IDs and can legitimately repeat for the same
guild+user pair (e.g. leave and rejoin within the dedup window).

Signed-off-by: Yordis Prieto <yordis.prieto@gmail.com>

Author: yordis

rsworkspace/crates/trogon-source-discord/src/gateway.rs

@@ -271,14 +271,6 @@ fn dedup_key(event_name: &str, id: impl std::fmt::Display) -> Option<String> {
     Some(format!("{event_name}:{id}"))
 }
 
-#[cfg(not(coverage))]
-fn dedup_key2(
-    event_name: &str,
-    a: impl std::fmt::Display,
-    b: impl std::fmt::Display,
-) -> Option<String> {
-    Some(format!("{event_name}:{a}:{b}"))
-}
 
 #[cfg(not(coverage))]
 fn extract_dedup_id(event_name: &str, event: &Event) -> Option<String> {
@@ -294,10 +286,9 @@ fn extract_dedup_id(event_name: &str, event: &Event) -> Option<String> {
         Event::GuildDelete(e) => dedup_key(event_name, e.id),
         Event::RoleCreate(e) => dedup_key(event_name, e.role.id),
         Event::RoleDelete(e) => dedup_key(event_name, e.role_id),
-        Event::MemberAdd(e) => dedup_key2(event_name, e.guild_id, e.user.id),
-        Event::MemberRemove(e) => dedup_key2(event_name, e.guild_id, e.user.id),
-        Event::BanAdd(e) => dedup_key2(event_name, e.guild_id, e.user.id),
-        Event::BanRemove(e) => dedup_key2(event_name, e.guild_id, e.user.id),
+        Event::MemberAdd(_) | Event::MemberRemove(_) | Event::BanAdd(_) | Event::BanRemove(_) => {
+            None
+        }
         Event::InteractionCreate(e) => dedup_key(event_name, e.id),
         Event::InviteCreate(e) => dedup_key(event_name, &e.code),
         Event::InviteDelete(e) => dedup_key(event_name, &e.code),
@@ -525,15 +516,6 @@ mod tests {
         );
     }
 
-    #[cfg(not(coverage))]
-    #[test]
-    fn dedup_key2_formats_correctly() {
-        assert_eq!(
-            dedup_key2("guild_member_add", 111, 222),
-            Some("guild_member_add:111:222".to_string())
-        );
-    }
-
     #[cfg(not(coverage))]
     #[test]
     fn event_name_returns_none_for_gateway_control() {