remaining review comments from #1613 (backport #5539)

[mergify]

This is an automatic backport of pull request #5539 done by Mergify.
Cherry-pick of 5d77221 has failed:

On branch mergify/bp/release/v8.1.x/pr-5539
Your branch is up to date with 'origin/release/v8.1.x'.

You are currently cherry-picking commit 5d772213.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   modules/apps/27-interchain-accounts/controller/ibc_middleware_test.go
	modified:   modules/apps/27-interchain-accounts/host/ibc_module_test.go
	modified:   modules/core/04-channel/types/msgs.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   e2e/README.md
	deleted by us:   e2e/tests/core/04-channel/upgrades_test.go
	deleted by us:   e2e/tests/transfer/incentivized_test.go
	deleted by us:   e2e/testsuite/grpc_query.go
	deleted by us:   e2e/testsuite/tx.go

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/github/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

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