chore: remove x/group dependency from testing

[gjermundgaraba]

Description

closes: IBCGO-2376

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Linked to GitHub issue with discussion and accepted design, OR link to spec that describes this work.
• Include changelog entry when appropriate (e.g. chores should be omitted from changelog).
• Wrote unit and integration tests if relevant.
• Updated documentation (docs/) if anything is changed.
• Added godoc comments if relevant.
• Self-reviewed Files changed in the GitHub PR explorer.
• Provide a conventional commit message to follow the repository standards.

[linear]

IBCGO-2376 Remove x/group from required dependency

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.02%. Comparing base (698cc74) to head (3546d85).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8599      +/-   ##
==========================================
+ Coverage   57.99%   58.02%   +0.03%     
==========================================
  Files         319      319              
  Lines       22814    22801      -13     
==========================================
  Hits        13231    13231              
+ Misses       8978     8965      -13     
  Partials      605      605              

Flag	Coverage Δ
08-wasm	65.99% <ø> (ø)
e2e	1.14% <ø> (+<0.01%)	⬆️
ibc-go	63.43% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[DeshErBojhaa]

Reducing LOC PR is the best PR.

🎉