refactor: prune everything (backport #11177)

[mergify]

This is an automatic backport of pull request #11177 done by Mergify.
Cherry-pick of 75bcf47 has failed:

On branch mergify/bp/release/v0.44.x/pr-11177
Your branch is up to date with 'origin/release/v0.44.x'.

You are currently cherry-picking commit 75bcf47f1.
  (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:   server/config/config.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   server/config/toml.go
	both modified:   server/start.go
	both modified:   store/rootmulti/store.go
	both modified:   store/types/pruning.go
	deleted by us:   store/v2/multi/store_test.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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[lgtm-com]

This pull request introduces 3 alerts when merging 358c9fc into 7875835 - view on LGTM.com

new alerts:

• 2 for Useless assignment to local variable
• 1 for Unreachable statement

[robert-zaremba]

@alexanderbez could you solve conflicts?

[alexanderbez]

@alexanderbez could you solve conflicts?

Yes, ofc.