E2E tests use repeated strings for test data where constants add no value (#97)

---------

Co-authored-by: Pasha Sviderski <me@psviderski.name>
Co-authored-by: Anton Ovchinnikov <anton@tonyo.info>

internal/machine/cluster/cluster.go

@@ -5,6 +5,10 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"log/slog"
+	"net/netip"
+	"time"
+
 	"github.com/psviderski/uncloud/internal/corrosion"
 	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"github.com/psviderski/uncloud/internal/machine/network"
@@ -13,9 +17,6 @@ import (
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 	"google.golang.org/protobuf/types/known/emptypb"
-	"log/slog"
-	"net/netip"
-	"time"
 )
 
 type Cluster struct {