feat: Add previous winners field to hackathon schema and update related tests

imphnen-backend/src/bin/seed_hackathons.rs

@@ -216,6 +216,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
             theme,
             rules,
             prizes,
+            previous_winners: None,
             organizers,
             is_deleted: false,
             created_at: Some(get_iso_date()),

imphnen-backend/src/bin/seed_test_submission.rs

@@ -1,7 +1,7 @@
 use chrono::{DateTime, Utc};
 use imphnen_hackathon::v1::hackathon::hackathon_schema::{
-    HackathonSchema, HackathonEventsSchema, HackathonTimelineSchema, HackathonSubmissionsSchema,
-    HackathonStatus, HackathonEventType, HackathonPhase, SubmissionStatus, Prize
+    HackathonSchema, HackathonTimelineSchema, HackathonSubmissionsSchema,
+    HackathonStatus, HackathonPhase, SubmissionStatus, Prize
 };
 use imphnen_iam::{UsersSchema, v1::teams::TeamsSchema};
 use imphnen_utils::{get_iso_date, hash_password};
@@ -259,6 +259,7 @@ async fn main() -> Result<(), Box<dyn Error>> {
             theme,
             rules,
             prizes,
+            previous_winners: None,
             organizers,
             is_deleted: false,
             created_at: Some(get_iso_date()),