fix Effect.forEach usage

[fubhy]

Effect.forEach has the callback signature f:

f: (a: A, i: number) => Effect<R, E, B>,

But .runForEach and .contramapEffect don't expect a second parameter. Hence, when using it in combination with something like Effect.log which has an optional second parameter, we'll pass the second parameter incorrectly.

This fixes Effect-TS/io#639

[changeset-bot]

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