test: shrink `ctor_many_fields` The test took 90s to 210s in CI and exceeded the 1500s timeout of the sanitizer build. The 900-field structure and 700-field inductive type are replaced by sizes just past the second spill object, and cases that only repeated a layout already covered are dropped. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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