Reduce Serialized Size of HybridInfo (#1485) #5556

Job	Run time
Additional Builds and Concurrency Tests	13m 6s
Basic Checks	19m 24s
Measure coverage	27m 10s
miri	4m 11s
Release builds and tests	9m 16s
sanitize (address)	17m 43s
sanitize (address, multi-threading)	19m 15s
Slow tests	19m 6s
sanitize (leak)	9m 19s
sanitize (leak, multi-threading)	8m 8s
	2h 26m 38s

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