refactor(core): Move more code into @n8n/permissions. Add aditional tests and docs (no-changelog) (#15062)

Co-authored-by: Danny Martini <danny@n8n.io>

packages/cli/test/integration/shared/db/users.ts

@@ -39,7 +39,6 @@ export async function newUser(attributes: Partial<User> = {}): Promise<User> {
 export async function createUser(attributes: Partial<User> = {}): Promise<User> {
 	const userInstance = await newUser(attributes);
 	const { user } = await Container.get(UserRepository).createUserWithProject(userInstance);
-	user.computeIsOwner();
 	return user;
 }