bug(scheduler): Fix controller id length check (#2226)

* bug(scheduler): Fix controller id length check

The job_run table has a foreign key to the server_controller private_id.
While this column is called a prviate_id it does not implement the wt_private_id
postgres domain type, and therefore does not have a minimum length of 10 characters.

internal/db/sqltest/tests/controller/controller_id.sql

@@ -0,0 +1,33 @@
+-- controller_id tests:
+--  validates the wt_controller_id domain
+
+begin;
+  select plan(8);
+
+  select has_domain('wt_controller_id');
+  
+  create table controller_id_testing (
+    id wt_controller_id
+  );
+
+  prepare empty_insert as insert into controller_id_testing (id) values ('');
+  SELECT throws_like(
+    'empty_insert',
+    '%"wt_controller_id_check"',
+    'We should error for empty controller id'
+  );
+  
+  prepare null_insert as insert into controller_id_testing (id) values (null);
+  select lives_ok('null_insert');
+  select is(count(*), 1::bigint) from controller_id_testing where id is null;
+
+  prepare valid_insert as insert into controller_id_testing (id) values ('test-controller-id');
+  select lives_ok('valid_insert');
+  select is(count(*), 1::bigint) from controller_id_testing where id = 'test-controller-id';
+  
+  prepare short_insert as insert into controller_id_testing (id) values ('_');
+  select lives_ok('short_insert');
+  select is(count(*), 1::bigint) from controller_id_testing where id = '_';
+
+  select * from finish();
+rollback;