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Merge remote-tracking branch 'upstream/main' into SND-TRANSCEIVER5dot2

Reconcile TRANSCEIVER-5.2 with post-#5572 shared helpers on main:
- zr_validation.go: keep TunableParamsTest / TunableParamsInterfaceFlapTest and  setupTunableParams; retain main's interfaceStateCleanup and toggle-with-cleanup helpers; use ToggleInterfaceState(t, dut, params) per phase.
- zrp_tunable_parameters_test.go: keep library entry points (no inlined flap test from main).