[release/7.0-preview7] Mark JsonSerializerOptions.TypeInfoResolver as nullable and linker-safe #72087
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Backport of #72044 to release/7.0-preview7
/cc @eiriktsarpalis
Customer Impact
This is a last-minute update to the nullability/linkability semantics of a key property in the new System.Text.Json contract customization feature that barely missed the snap deadline. We want to make sure that the change gets appropriate soak time by being incorporated in Preview 7. See #71960 for more details on the technical reasons that motivated the change.
Testing
Tests have been updated to reflect the changed semantics where appropriate.
Risk
Low. Changing semantics of a pre-release feature.