Improve heuristic that triggers onStartReached #1600

Job	Run time
set_release_type	1s
prepare_hermes_workspace	37s
build_hermesc_apple	33s
build_android	14m 38s
build_apple_slices_hermes (Debug, macosx)	20m 56s
build_apple_slices_hermes (Debug, iphoneos)	8m 43s
build_apple_slices_hermes (Debug, iphonesimulator)	12m 20s
build_apple_slices_hermes (Debug, catalyst)	16m 56s
build_apple_slices_hermes (Release, macosx)	13m 53s
build_apple_slices_hermes (Release, iphoneos)	7m 42s
build_apple_slices_hermes (Release, iphonesimulator)	12m 18s
build_apple_slices_hermes (Release, catalyst)	10m 32s
test_android	17m 10s
build_hermes_macos (Debug)	5m 6s
build_hermes_macos (Release)	4m 43s
test_ios_rntester_dynamic_frameworks (Hermes)	36m 27s
test_ios_rntester (Hermes, NewArch)	31m 59s
test_ios_rntester_ruby_3_2_0	33m 46s
test_ios_rntester_dynamic_frameworks (JSC)	31m 39s
test_ios_rntester (Hermes, OldArch)	34m 22s
test_ios_rntester (JSC, NewArch)	28m 9s
test_ios_rntester (JSC, OldArch)	30m 40s
	6h 13m 10s

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