refactor(runtime): reduce loop iteration complexity of checkStoreUpgrade (backport #21791)

[mergify]

Description

The implementation of IsDeleted and IsAdded use a range iterator, this increases the complexity of checkStoreUpgrade.

Summary by CodeRabbit

• Bug Fixes
  • Improved logic for checking duplicates in store upgrades, enhancing clarity and correctness.
  • Reduced risk of errors in duplicate detection by separating checks for added and deleted keys.

---

This is an automatic backport of pull request #21791 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of 0042db5 has failed:

On branch mergify/bp/release/v0.52.x/pr-21791
Your branch is up to date with 'origin/release/v0.52.x'.

You are currently cherry-picking commit 0042db5ea.
  (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:   runtime/store.go

Unmerged paths:
  (use "git add/rm <file>..." as appropriate to mark resolution)
	deleted by us:   runtime/v2/store.go

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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