feat: initial admin PAT has IAM_LOGIN_CLIENT (#10143)

# Which Problems Are Solved

We provide a seamless way to initialize Zitadel and the login together.

# How the Problems Are Solved

Additionally to the `IAM_OWNER` role, a set up admin user also gets the
`IAM_LOGIN_CLIENT` role if it is a machine user with a PAT.

# Additional Changes

- Simplifies the load balancing example, as the intermediate
configuration step is not needed anymore.

# Additional Context

- Depends on #10116 
- Contributes to https://github.com/zitadel/zitadel-charts/issues/332
- Contributes to https://github.com/zitadel/zitadel/issues/10016

---------

Co-authored-by: Stefan Benz <46600784+stebenz@users.noreply.github.com>

internal/command/org.go

@@ -24,9 +24,15 @@ type InstanceOrgSetup struct {
 	CustomDomain string
 	Human        *AddHuman
 	Machine      *AddMachine
+	LoginClient  *AddLoginClient
 	Roles        []string
 }
 
+type AddLoginClient struct {
+	Machine *Machine
+	Pat     *AddPat
+}
+
 type OrgSetup struct {
 	Name         string
 	CustomDomain string