fix: allow tx decoding to fail in GetBlockWithTxs (backport #20323)

[mergify]

Description

Fixes the GetBlocksWithTxs endpoint (/cosmos/tx/v1beta1/txs/block/{height}) by allowing the decoding of txs to fail silently (but with a log). These failing txs are actually injected vote extensions.

In the future we might want to do something more useful here, like returning the raw bytes, so clients can analyze the vote extensions being used.

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Author Checklist

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• added a changelog entry to CHANGELOG.md
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Summary by CodeRabbit

• Refactor
  • Improved error handling in transaction processing by logging errors for better diagnostics instead of directly returning them.

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This is an automatic backport of pull request #20323 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of e33884f has failed:

On branch mergify/bp/release/v0.50.x/pr-20323
Your branch is up to date with 'origin/release/v0.50.x'.

You are currently cherry-picking commit e33884f79.
  (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:   x/auth/tx/service.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   x/auth/CHANGELOG.md

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

[github-actions]

@tac0turtle your pull request is missing a changelog!