collab: Require github_user_created_at at ingress points (#17180)

This PR makes the `github_user_created_at` field required at ingress
points into collab.

In practice we already have this value passed up, this change just makes
that explicit.

This is a precursor to making it required in the database.

Release Notes:

- N/A

crates/collab/src/db/tests/contributor_tests.rs

@@ -25,7 +25,7 @@ async fn test_contributors(db: &Arc<Database>) {
     assert_eq!(db.get_contributors().await.unwrap(), Vec::<String>::new());
 
     let user1_created_at = Utc::now();
-    db.add_contributor("user1", 1, None, Some(user1_created_at), None)
+    db.add_contributor("user1", 1, None, user1_created_at, None)
         .await
         .unwrap();
     assert_eq!(
@@ -34,7 +34,7 @@ async fn test_contributors(db: &Arc<Database>) {
     );
 
     let user2_created_at = Utc::now();
-    db.add_contributor("user2", 2, None, Some(user2_created_at), None)
+    db.add_contributor("user2", 2, None, user2_created_at, None)
         .await
         .unwrap();
     assert_eq!(

crates/collab/src/db/tests/db_tests.rs

@@ -101,7 +101,7 @@ async fn test_get_or_create_user_by_github_account(db: &Arc<Database>) {
         .user_id;
 
     let user = db
-        .get_or_create_user_by_github_account("the-new-login2", 102, None, Some(Utc::now()), None)
+        .get_or_create_user_by_github_account("the-new-login2", 102, None, Utc::now(), None)
         .await
         .unwrap();
     assert_eq!(user.id, user_id2);
@@ -113,7 +113,7 @@ async fn test_get_or_create_user_by_github_account(db: &Arc<Database>) {
             "login3",
             103,
             Some("user3@example.com"),
-            Some(Utc::now()),
+            Utc::now(),
             None,
         )
         .await