fix(x/group): proper address rendering in error (backport #22425)

[mergify]

Description

Closes: #22414

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Summary by CodeRabbit

• Bug Fixes
  • Improved error handling for unauthorized message signers, enhancing clarity in error messages.
  • Updated error reporting to provide a meaningful output even when address conversion fails.

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This is an automatic backport of pull request #22425 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 8c24b6b has failed:

On branch mergify/bp/release/v0.50.x/pr-22425
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit 8c24b6bef.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   x/group/keeper/proposal_executor.go

no changes added to commit (use "git add" and/or "git commit -a")

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

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