module: fix extensionless CJS files in `"type": "module"` packages #4110

Job	Run time
Build slim tarball	2m 33s
aarch64-linux: with shared libraries	25m 22s
x86_64-linux: with shared libraries	24m 58s
aarch64-darwin: with shared libraries	27m 31s
x86_64-darwin: with shared libraries	44m 55s
	2h 5m 19s

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