Fix: deterministically fetch perp info from state (backport #2341)

[mergify]

Changelist

Problem: The ordering a map iteration in go is not deterministic. If the iteration loop completes, the final result is the same. However, if the loop exits in the middle (ie goes over the gas limit -> abort), then the different sets of perp ids have been iterated on; therefore creates a non-deterministic behavior in terms of gas usage.

Fix: deterministically order the perp ids to iterate over by sorting first.

Test Plan

Unit test

Author/Reviewer Checklist

• If this PR has changes that result in a different app state given the same prior state and transaction list, manually add the state-breaking label.
• If the PR has breaking postgres changes to the indexer add the indexer-postgres-breaking label.
• If this PR isn't state-breaking but has changes that modify behavior in PrepareProposal or ProcessProposal, manually add the label proposal-breaking.
• If this PR is one of many that implement a specific feature, manually label them all feature:[feature-name].
• If you wish to for mergify-bot to automatically create a PR to backport your change to a release branch, manually add the label backport/[branch-name].
• Manually add any of the following labels: refactor, chore, bug.

Summary by CodeRabbit

• New Features

  • Introduced a new perpetual position for SOL, enhancing the available options for users.

• Bug Fixes

  • Improved clarity in the naming of variables related to subaccount and perpetual IDs, ensuring better understanding and maintenance.

• Tests

  • Added a new test to validate consistent gas usage for the GetAllRelevantPerpetuals method, ensuring reliability under varying conditions.

---

This is an automatic backport of pull request #2341 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of cc1b795 has failed:

On branch mergify/bp/release/protocol/v5.2.x/pr-2341
Your branch is up to date with 'origin/release/protocol/v5.2.x'.

You are currently cherry-picking commit cc1b7954.
  (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)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   protocol/testutil/constants/positions.go
	both modified:   protocol/x/subaccounts/keeper/subaccount.go
	both modified:   protocol/x/subaccounts/keeper/subaccount_test.go

no changes added to commit (use "git add" and/or "git commit -a")

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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