Reduce Serialized Size of HybridInfo #5554

Job	Run time
Basic Checks	21m 14s
Additional Builds and Concurrency Tests	14m 47s
miri	3m 2s
Measure coverage	27m 8s
Release builds and tests	9m 34s
Slow tests	18m 14s
sanitize (address)	20m 13s
sanitize (address, multi-threading)	22m 39s
sanitize (leak)	12m 39s
sanitize (leak, multi-threading)	8m 5s
	2h 37m 35s

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