do not use slices with 1.20

Signed-off-by: 'Renan Rangel' <[email protected]>

go/vt/mysqlctl/mysqlshellbackupengine.go

@@ -26,7 +26,6 @@ import (
 	"os"
 	"os/exec"
 	"path"
-	"slices"
 	"strings"
 	"sync"
 	"time"
@@ -513,7 +512,7 @@ func cleanupMySQL(ctx context.Context, params RestoreParams, shouldDeleteUsers b
 	// drop all databases
 	for _, row := range result.Rows {
 		dbName := row[0].ToString()
-		if slices.Contains(internalDBs, dbName) {
+		if sliceContains(internalDBs, dbName) {
 			continue // not dropping internal DBs
 		}
 
@@ -548,7 +547,7 @@ func cleanupMySQL(ctx context.Context, params RestoreParams, shouldDeleteUsers b
 			if user == currentUser {
 				continue // we don't drop the current user
 			}
-			if slices.Contains(reservedUsers, user) {
+			if sliceContains(reservedUsers, user) {
 				continue // we skip reserved MySQL users
 			}
 
@@ -562,3 +561,13 @@ func cleanupMySQL(ctx context.Context, params RestoreParams, shouldDeleteUsers b
 
 	return err
 }
+
+func sliceContains[S ~[]E, E comparable](s S, v E) bool {
+	for _, item := range s {
+		if item == v {
+			return true
+		}
+	}
+
+	return false
+}

go/vt/mysqlctl/mysqlshellbackupengine_test.go

@@ -396,3 +396,38 @@ func TestMySQLShellBackupEngine_ExecuteBackup_ReleaseLock(t *testing.T) {
 	})
 
 }
+
+func Test_sliceContains(t *testing.T) {
+	tests := []struct {
+		slice []any
+		value any
+		want  bool
+	}{
+		{
+			[]any{"apple", "banana", "cherry"},
+			"apple",
+			true,
+		},
+		{
+			[]any{"apple", "banana", "cherry"},
+			"banana",
+			true,
+		},
+		{
+			[]any{"apple", "banana", "cherry"},
+			"cherry",
+			true,
+		},
+		{
+			[]any{"apple", "banana", "cherry"},
+			"dragonfruit",
+			false,
+		},
+	}
+
+	for i, tt := range tests {
+		t.Run(fmt.Sprintf("#%d", i), func(t *testing.T) {
+			assert.Equal(t, tt.want, sliceContains(tt.slice, tt.value))
+		})
+	}
+}