Fix VPA crash on defaulted direct supertypes, optimize

[aosen-xiong]

Fix #786 by applying computed/default annotations to direct supertypes before viewpoint adaptation.

Direct supertype computation substitutes type variables into supertypes, such as turning Box into Box.

Previously, viewpoint adaptation ran before those substituted supertypes had their default qualifiers applied, so VPA could see an unannotated type argument and crash.

This changes the ordering so direct supertypes are defaulted first, then viewpoint-adapted.

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[wmdietl]

@aosen-xiong Can you resolve the merge?

With Antigravity I moved this change into SupertypeFinder, which seems like a better place for this. Do you see any problem with this?

[aosen-xiong]

@aosen-xiong Can you resolve the merge?

With Antigravity I moved this change into SupertypeFinder, which seems like a better place for this. Do you see any problem with this?

I think the approach is good.

The previous approach will call atypeFactory.addComputedTypeAnnotations(..., adt) twice in supertypesFromElement because the createEnumSuperType call it, and the added loop also calls it.

I adjusted the enum handling so its supertype is computed exactly once on both the element and tree paths.

[wmdietl]

I have pushed two follow-up commits to this PR:

1. Resolved the CHANGELOG.md conflict: Integrated both eisop#786 and eisop#1965 into the closed issues list.
2. Optimized SupertypeFinder to avoid re-defaulting Object: The initial PR logic safely defaults Object, but because Object was sourced from toAnnotatedType(superClass, false), it created an undefaulted Object which then had addComputedTypeAnnotations redundantly applied to it over and over for every generic parameterization (as tracked by directSupertypesCache). I updated the logic to always use AnnotatedTypeMirror.createTypeOfObject(atypeFactory) instead, which hits the elementCache and is already pre-defaulted. We then bypass the addComputedTypeAnnotations trailing loop for Object, entirely eliminating the redundant processing noted in performance-notes.md.

Let me know if you have any questions!