Check that round-tripped data is equal in tests

[kevinji]

Closes: #XXX

Description

This re-adds a check that was previously commented out.

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PR author checklist:

• Added changelog entry, using unclog.
• Added tests.
• Linked to GitHub issue.
• Updated code comments and documentation (e.g., docs/).
• Tagged one reviewer who will be the one responsible for shepherding this PR.

Reviewer checklist:

• Reviewed Files changed in the GitHub PR explorer.
• Manually tested (in case integration/unit/mock tests are absent).

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change

Comparison is base (127f129) 71.52% compared to head (da09d69) 71.52%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #497   +/-   ##
=======================================
  Coverage   71.52%   71.52%           
=======================================
  Files         125      125           
  Lines       15890    15893    +3     
=======================================
+ Hits        11365    11368    +3     
  Misses       4525     4525           

Impacted Files	Coverage Δ
crates/ibc/src/test.rs	100.00% <100.00%> (ø)

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[plafer]

Thanks!