Use eir.yaml as the single default configuration and select tests through
ABTS arguments, following the handover runner. Remove mode/policy
environment variables, eir-allow.yaml, and duplicate integration runs.
Move direct SBI endpoint parsing and readiness checks into service-test.
Always provision GUTI equipment fixtures and run EIR rejection cases.
Add eir-fsm to the eir suite and extend AMF/MME state-machine coverage for
policy outcomes and deferred session cleanup. Cover EIR-disabled and
allow-policy paths in FSM tests instead of separate integration runs.
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