Add requires_zed_cla column to channels table

Don't allow granting guests write access in a call where the channel
or one of its ancestors requires the zed CLA, until that guest has
signed the Zed CLA.

Co-authored-by: Marshall <marshall@zed.dev>

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

@@ -23,13 +23,13 @@ async fn test_contributors(db: &Arc<Database>) {
 
     assert_eq!(db.get_contributors().await.unwrap(), Vec::<String>::new());
 
-    db.add_contributor("user1", 1, None).await.unwrap();
+    db.add_contributor("user1", Some(1), None).await.unwrap();
     assert_eq!(
         db.get_contributors().await.unwrap(),
         vec!["user1".to_string()]
     );
 
-    db.add_contributor("user2", 2, None).await.unwrap();
+    db.add_contributor("user2", Some(2), None).await.unwrap();
     assert_eq!(
         db.get_contributors().await.unwrap(),
         vec!["user1".to_string(), "user2".to_string()]

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

@@ -105,7 +105,7 @@ 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)
+        .get_or_create_user_by_github_account("the-new-login2", Some(102), 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>) {
     assert_eq!(user.github_user_id, Some(102));
 
     let user = db
-        .get_or_create_user_by_github_account("login3", 103, Some("user3@example.com"))
+        .get_or_create_user_by_github_account("login3", Some(103), Some("user3@example.com"))
         .await
         .unwrap();
     assert_eq!(&user.github_login, "login3");