Verify the header's expected value of ibc_to_abci_client_events test with an event from ibc-go

[Farhad-Shabani]

Summary

Verify the header's expected string value in ibc_to_abci_client_events() test with an emitted event on the ibc-go

Details

The testing chain (respectively generated header) structure & params on ibc-go does not correspond with the dummy header we create through get_dummy_ics07_header() function. we already run the test with the mock header. Thus, it tests the conversion internally, but does not check it against an emitted UpdateClient event on ibc-go