[#972] pilorama: Remove removeDuplicatesInPlace()

Also, check that slices.CompareFunc() indeed passes all the tests before
removal.

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

pkg/local_object_storage/pilorama/batch_test.go

@@ -1,70 +0,0 @@
-package pilorama
-
-import (
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-func Test_removeDuplicatesInPlace(t *testing.T) {
-	testCases := []struct {
-		before []int
-		after  []int
-	}{
-		{
-			before: []int{},
-			after:  []int{},
-		},
-		{
-			before: []int{1},
-			after:  []int{1},
-		},
-		{
-			before: []int{1, 2},
-			after:  []int{1, 2},
-		},
-		{
-			before: []int{1, 2, 3},
-			after:  []int{1, 2, 3},
-		},
-		{
-			before: []int{1, 1, 2},
-			after:  []int{1, 2},
-		},
-		{
-			before: []int{1, 2, 2},
-			after:  []int{1, 2},
-		},
-		{
-			before: []int{1, 2, 2, 3},
-			after:  []int{1, 2, 3},
-		},
-		{
-			before: []int{1, 1, 1},
-			after:  []int{1},
-		},
-		{
-			before: []int{1, 1, 2, 2},
-			after:  []int{1, 2},
-		},
-		{
-			before: []int{1, 1, 1, 2, 3, 3, 3},
-			after:  []int{1, 2, 3},
-		},
-	}
-
-	for _, tc := range testCases {
-		ops := make([]*Move, len(tc.before))
-		for i := range ops {
-			ops[i] = &Move{Meta: Meta{Time: Timestamp(tc.before[i])}}
-		}
-
-		expected := make([]*Move, len(tc.after))
-		for i := range expected {
-			expected[i] = &Move{Meta: Meta{Time: Timestamp(tc.after[i])}}
-		}
-
-		actual := removeDuplicatesInPlace(ops)
-		require.Equal(t, expected, actual, "%d", tc.before)
-	}
-}