fix: DirFromModule related tests on Windows (#3289)

Signed-off-by: Diogenes Fernandes <diofeher@gmail.com>

go.mod

@@ -3,7 +3,10 @@ module github.com/opentofu/opentofu
 // At the time of adding this configuration, the new Go feature introduced here https://github.com/golang/go/issues/67061,
 // was having a good amount of issues linked to, affecting AWS Firewall, GCP various services and a lot more.
 // In go1.23 the godebug flag for this was named 'tlskyber', renamed in go1.24 to 'tlsmlkem'. https://tip.golang.org/doc/godebug#go-124
-godebug tlsmlkem=0
+godebug (
+	tlsmlkem=0
+	winsymlink=0 // See https://github.com/opentofu/opentofu/pull/3289
+)
 
 require (
 	cloud.google.com/go/kms v1.15.5

internal/command/init_test.go

@@ -13,6 +13,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 	"testing"
 	"time"
@@ -118,6 +119,14 @@ func TestInit_fromModule_cwdDest(t *testing.T) {
 func TestInit_fromModule_dstInSrc(t *testing.T) {
 	dir := t.TempDir()
 	t.Chdir(dir)
+
+	defer func() {
+		// Trigger garbage collection to ensure that all open file handles are closed.
+		// This prevents TempDir RemoveAll cleanup errors on Windows.
+		if runtime.GOOS == "windows" {
+			runtime.GC()
+		}
+	}()
 	if err := os.Mkdir("foo", os.ModePerm); err != nil {
 		t.Fatal(err)
 	}