Pass io-manager=native to tests

[jasagredo]

This PR is an alternative to #10366, which makes use of --io-manager=native in the ghci and cabal invocations in tests. Although this ought to make the tests pass, the question of whether cabal should use the system temp directory still remains.

This should close #10191 too, although not really for final users, only for our test-suite. End users will still have problems when building long-path'ed projects like backpack projects, but they can use --io-manager=native too 🤷 .

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This PR does not modify behaviour or interface

E.g. the PR only touches documentation or tests, does refactorings, etc.

Include the following checklist in your PR:

• Patches conform to the coding conventions.
• Is this a PR that fixes CI? If so, it will need to be backported to older cabal release branches (ask maintainers for directions). Probably worth backporting