Ban inferred return type on async and generator functions. #29950

Job	Run time
lint	52s
browser-integration	1m 16s
Test Node 22 on ubuntu-latest	8m 22s
Test Node 20 on ubuntu-latest	9m 40s
baselines	9m 1s
format	26s
Test Node 18 on ubuntu-latest	10m 35s
Test Node 16 on ubuntu-latest	10m 16s
Test Node 14 on ubuntu-latest	10m 48s
package-size	1m 31s
Test Node 22 on windows-latest	9m 36s
Test Node 20 on windows-latest	10m 48s
misc	26s
self-check	58s
Test Node 18 on windows-latest	11m 15s
Test Node 16 on windows-latest	11m 37s
smoke	54s
Test Node 14 on windows-latest	11m 51s
typecheck	44s
Test Node 22 on macos-14	8m 40s
Test Node 20 on macos-14	7m 22s
Test Node 18 on macos-14	7m 57s
Test Node 16 on macos-14	8m 52s
Test Node * on ubuntu-latest with --no-bundle	10m 29s
	2h 44m 16s

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