fuzz: improve CI iteration strategy, add corpus minimization and summary reporting #22498

Job	Run time
ext-test	5m 32s
rustfmt	15s
linting	2m 27s
tor-connect	4m 30s
check_release	2m 51s
fuzz	1h 59m 38s
build-nostd / build (self-hosted, 1.75.0)	16m 11s
fuzz_sanity	9m 59s
build-bindings / build (self-hosted, 1.75.0)	17m 46s
check_docs	6m 57s
build-cfg-flags / build (self-hosted, 1.75.0)	13m 25s
build-features / build (self-hosted, 1.75.0)	28m 57s
benchmark	17m 43s
build-sync / build (self-hosted, 1.75.0)	18m 35s
build-workspace / build (self-hosted, 1.75.0)	13m 41s
coverage	19m 53s
notify-failure	0s
	4h 58m 20s

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