Check counterparty port id during the channel handshake

[mpoke]

Check counterparty port id during the channel handshake, i.e.,

interchain-security/x/ccv/parent/module.go

Line 236 in eccbfaa

func (am AppModule) OnChanOpenTry(

and

interchain-security/x/ccv/child/module.go

Line 221 in eccbfaa

func (am AppModule) OnChanOpenInit(

See spec, i.e., https://github.com/cosmos/ibc/blob/main/spec/app/ics-028-cross-chain-validation/methods.md#ccv-ccf-coinit1 and https://github.com/cosmos/ibc/blob/main/spec/app/ics-028-cross-chain-validation/methods.md#ccv-pcf-cotry1