feat: re-enable full cachefiles test coverage

storage/sealer/proofpaths/cachefiles_test.go

@@ -10,10 +10,6 @@ import (
 
 func TestSDRLayersDefined(t *testing.T) {
 	for proof := range abi.SealProofInfos {
-		// TODO: Drop after feat/nv21 is merged in (that is, when SynthPoRep changes land)
-		if proof >= abi.RegisteredSealProof_StackedDrg2KiBV1_1_Feat_SyntheticPoRep && proof <= abi.RegisteredSealProof_StackedDrg64GiBV1_1_Feat_SyntheticPoRep {
-			continue
-		}
 		_, err := SDRLayers(proof)
 		require.NoError(t, err)
 	}