Commits on Jun 21, 2024

1. ibc: delete packet commitments instead of writing empty values …

   The IBC spec calls for deletion of packet commitments after a
   successful acknowledgement, in order to avoid double-acknowledgements.
   
   Previously, our implementation accomplished this deletion by writing
   an empty byte slice vec![] to the commitment path.
   
   However, this will cause nonexistence proofs by exclusion (the
   standard NX-proof type used in ics23) of adjacent keys to fail,
   since ics23 does not support existence proofs of empty values.
   
   This PR changes `delete_packet_commitment` to actually delete the
   commitment, and introduces a migration for testnet 78 that will
   delete all of the previously overwritten commitments.

   

   avahowell authored and erwanor committed Jun 21, 2024
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