chore: remove organization_id suffix from org_member roles in database (#13473)

Organization member's table is already scoped to an organization.
Rolename should avoid having the org_id appended.

Wipes all existing organization role assignments, which should not be used anyway.

coderd/database/migrations/000215_scoped_org_db_roles.down.sql

@@ -0,0 +1 @@
+ALTER TABLE ONLY organization_members ALTER COLUMN roles SET DEFAULT '{organization-member}';

coderd/database/migrations/000215_scoped_org_db_roles.up.sql

@@ -0,0 +1,7 @@
+-- The default was 'organization-member', but we imply that in the
+-- 'GetAuthorizationUserRoles' query.
+ALTER TABLE ONLY organization_members ALTER COLUMN roles SET DEFAULT '{}';
+
+-- No one should be using organization roles yet. If they are, the names in the
+-- database are now incorrect. Just remove them all.
+UPDATE organization_members SET roles = '{}';