Fix widening of default options types when variables contain constant types

[jerelmiller]

Fixes #13342

TypeScript playground of the reproduction: https://tsplay.dev/mAbMQW

[apollo-librarian]

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[pkg-pr-new]

npm i https://pkg.pr.new/@apollo/client@13352

commit: f1d25c9

[oceandrama]

Confirmed on our app (dam-client-web) with signatureStyle: "modern":

• @apollo/client@4.2.7 — typecheck fails with DeepPartial / possibly 'undefined' on nested useQuery / useSuspenseQuery data (same as this issue)
• https://pkg.pr.new/@apollo/client@13352 — typecheck passes cleanly with modern signatures enabled

So the fix in #13352 looks good for our real queries (complex variables / input objects). Thanks!

[jerelmiller]

Superseded by #13382