[chore][internal/otelarrow] Unskip test (#34391)

**Description:** <Describe what has changed.>
<!--Ex. Fixing a bug - Describe the bug and how this fixes the issue.
Ex. Adding a feature - Explain what this achieves.-->
This reverts
#34362
as
#34260
was merged to resolve the test. The flakiness should be resolved so we
no longer need to skip this test.

internal/otelarrow/compression/zstd/mru_test.go

@@ -4,7 +4,6 @@
 package zstd
 
 import (
-	"runtime"
 	"testing"
 	"time"
 
@@ -64,10 +63,6 @@ func TestMRUPut(t *testing.T) {
 }
 
 func TestMRUReset(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("skipping test on Windows, see https://github.com/open-telemetry/opentelemetry-collector-contrib/issues/34252")
-	}
-
 	defer resetTest()
 
 	var m mru[*gint]