Improve performance of hybrid encrypt CLI #5549

Job	Run time
Basic Checks	19m 51s
Measure coverage	26m 44s
Additional Builds and Concurrency Tests	13m 54s
miri	3m 7s
Release builds and tests	10m 47s
sanitize (address)	17m 38s
sanitize (address, multi-threading)	18m 18s
Slow tests	20m 5s
sanitize (leak)	7m 45s
sanitize (leak, multi-threading)	9m 10s
	2h 27m 19s

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