[TRA-233] Fix IsIsolatedPerpetual function orientation (backport #1403)

[mergify]

Changelist

Currently, IsIsolatedPerpetual returns True for cross perpetuals and its callers expect the same, which is the wrong orientation for the function. This change fixes this behavior

Test Plan

Existing tests

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.
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This is an automatic backport of pull request #1403 done by [Mergify](https://mergify.com).

[linear]

TRA-233 Fix IsIsolatedPerpetual function based on internal audit

[coderabbitai]

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