chore: Force license uuids to not be null (#6012)

* chore: Force license uuids to not be null

* All unit tests generate uuids for licenses

* Update migration files to new numbers

* Put migration in transaction

coderd/database/migrations/000097_license_not_null_uuid.down.sql

@@ -0,0 +1 @@
+ALTER TABLE ONLY licenses ALTER COLUMN uuid DROP NOT NULL;

coderd/database/migrations/000097_license_not_null_uuid.up.sql

@@ -0,0 +1,8 @@
+BEGIN;
+
+-- We need to assign uuids to any existing licenses that don't have them.
+UPDATE licenses SET uuid = gen_random_uuid() WHERE uuid IS NULL;
+-- Assert no licenses have null uuids.
+ALTER TABLE ONLY licenses ALTER COLUMN uuid SET NOT NULL;
+
+COMMIT;