Fix random spec failures due to non-deterministic order

What does this MR do and why?

Closes #343862 (closed)

See contain_exactly matcher docs https://relishapp.com/rspec/rspec-expectations/docs/built-in-matchers/contain-exactly-matcher By using this matcher we do not test the order of expected elements, but Issue.public_only and Issue.without_hidden seem to not provide ordered returned elements.

@serenafang Could you please review?

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Related to #343862 (closed)