refactor: remove crossing hellos from 03-connection (backport #1672)

[mergify]

This is an automatic backport of pull request #1672 done by Mergify.
Cherry-pick of 9aab42d has failed:

On branch mergify/bp/release/v4.0.x/pr-1672
Your branch is up to date with 'origin/release/v4.0.x'.

You are currently cherry-picking commit 9aab42d.
  (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:   docs/ibc/proto-docs.md
	modified:   modules/core/03-connection/keeper/handshake.go
	modified:   modules/core/03-connection/keeper/handshake_test.go
	modified:   modules/core/03-connection/types/tx.pb.go
	modified:   modules/core/03-connection/types/version.go
	modified:   modules/core/03-connection/types/version_test.go
	modified:   modules/core/keeper/msg_server.go
	modified:   proto/ibc/core/connection/v1/tx.proto

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   docs/migrations/v3-to-v4.md
	both modified:   testing/coordinator.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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