refactor: Simplify SimulationManager setup (backport #12153)

[mergify]

This is an automatic backport of pull request #12153 done by Mergify.
Cherry-pick of 544afb6 has failed:

On branch mergify/bp/release/v0.45.x/pr-12153
Your branch is up to date with 'origin/release/v0.45.x'.

You are currently cherry-picking commit 544afb65e.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
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Changes to be committed:
	modified:   types/module/simulation.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   simapp/app.go

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[tac0turtle]

id rather not backport api breaking changes with 0.46 right around the corner

[robert-zaremba]

This is not API breaking

[tac0turtle]

ah true, missed the variable change