chore: add debug log for failed preview mode cookie verification #97766

Job	Run time
validate-docs-links	18s
Determine changes	12s
build-next / build	12s
optimize-ci / Graphite CI Optimizer	4s
lint	0s
build-native / build	10s
test devlow package / build	11s
test next-swc wasm	0s
build-native-windows / build	11s
test cargo benches	0s
ast-grep lint	0s
rustdoc check	0s
rust check	0s
test next-swc wasi	0s
test cargo unit	0s
test turbopack dev	0s
Test new and changed tests for flakes (prod)	0s
test cache components integration	0s
test rspack production integration	0s
test next-config-ts-native-ts dev	0s
test turbopack integration	0s
test dev	0s
test integration	0s
types and precompiled	0s
test firefox and safari	0s
Test new and changed tests for flakes (dev)	0s
test rspack development integration	0s
Test new and changed tests when deployed	0s
test rspack production	0s
test rspack dev	0s
test prod	0s
test cache components dev	0s
test unit	0s
Run devlow benchmarks	0s
test next-config-ts-native-ts prod	0s
test cache components prod	0s
Test new and changed tests when deployed (cache components)	0s
test turbopack production	0s
test dev windows	-1s
test unit windows	-1s
test prod windows	-1s
thank you, next	5s
test integration windows	-1s
	1m 19s

Provide feedback