Initialize NextSequenceSend in ProvideCounterparty handler

[DimitrisJim]

Raised by @colin-axner in https://github.com/cosmos/ibc-go/pull/7174/files#r1752160538:

Lets initialize the packet sequence when setting the counterparty? This would allow us to remove the if's in send packet. I feel like calling ProvideCounterparty should be viewed as finalizing the communication details

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[damiannolan]

We currently set the NextSequenceSend nonce in SendPacket here, where we have access to a port identifier as dictated by the application.

The ics24 path used here is the existing v1 path, which includes the port identifier. In v2/eureka, I would expect the ics24 path to not include the port id.

Currently, we do not have any port id within scope in the ProvideCounterparty rpc handler, and I would not expect there to be one.

[DimitrisJim]

done in #7449