fix: Simulation is not deterministic due to GenSignedMockTx (backport #12374)

[mergify]

This is an automatic backport of pull request #12374 done by Mergify.
Cherry-pick of 17dc431 has failed:

On branch mergify/bp/release/v0.46.x/pr-12374
Your branch is up to date with 'origin/release/v0.46.x'.

You are currently cherry-picking commit 17dc43166.
  (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/distribution/simulation/operations.go
	modified:   x/staking/simulation/operations.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   simapp/helpers/test_helpers.go
	both modified:   simapp/test_helpers.go
	both modified:   x/authz/simulation/operations.go
	both modified:   x/bank/simulation/operations.go
	both modified:   x/genutil/gentx_test.go
	both modified:   x/gov/simulation/operations.go
	both modified:   x/group/simulation/operations.go
	both modified:   x/nft/simulation/operations.go
	both modified:   x/simulation/util.go
	both modified:   x/slashing/simulation/operations.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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[alexanderbez]

@Muggle-Du do you think you could help address the merge conflicts here from backporting #12374?

[julienrbrt]

@Mergifyio rebase

[mergify]

rebase

✅ Branch has been successfully rebased

[alexanderbez]

Merge conflicts need to be addressed :)

[adu-crypto]

@Muggle-Du do you think you could help address the merge conflicts here from backporting #12374?

sorry for missing this msg, I can help with this

[julienrbrt]

I can do it otherwise, that's why I was assigned to the PR.