Hooks: use the appropriate Cabal unit ID

[sheaf]

This commit updates the logic in SetupWrapper for determining which installed Cabal unit ID to use. When we are compiling a package with build-type Hooks via an external Setup executable, we need to add a dependency on Cabal. However, we must be sure to use the same version of Cabal that the Cabal-hooks dependency depends on, to avoid #11331.

Fixes #11331

TODO:

• Fix the test I have added (PackageTests/SetupHooks/T11331). Currently, the test framework doesn't seem to allow changing something like the containers version, expecting it to be pinned. So I'm not sure how to proceed.

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