fserrors: fix out of space detection on Windows - fixes #8011

IsErrNoSpace compared against syscall.ENOSPC. Go defines that constant on
Windows as a value in its application reserved range which no Windows API
returns, so the comparison could never be true there. A full disk on Windows
reports ERROR_DISK_FULL or ERROR_HANDLE_DISK_FULL instead.

Preallocation failures were still caught, because those return a separate
sentinel, but a disk that is already full fails at the directory creation or
at the open long before preallocation is reached. That is the case reported.

The errors are now held in a list which platform specific files add to in
their init, which is the shape retriable_errors already uses in this package,
and the comparison itself is unchanged. Windows appends the two codes that
lib/file already recognises when preallocation fails. Every other platform
keeps exactly the behaviour it had.

This also reaches the VFS cache, which uses the same helper and has no
preallocation path of its own, so its out of space handling has been inert
on Windows.

backend/local/local_internal_diskfull_windows_test.go

@@ -0,0 +1,37 @@
+//go:build windows
+
+package local
+
+import (
+	"os"
+	"testing"
+
+	"github.com/rclone/rclone/fs/fserrors"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+	"golang.org/x/sys/windows"
+)
+
+func TestUpdateFatalIfNoSpaceWindows(t *testing.T) {
+	tests := []struct {
+		name string
+		err  error
+	}{
+		{"ERROR_DISK_FULL", windows.ERROR_DISK_FULL},
+		{"openat PathError", &os.PathError{Op: "openat", Path: "test.txt", Err: windows.ERROR_DISK_FULL}},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			t.Run("off", func(t *testing.T) {
+				err := updateWithReader(t, false, test.err)
+				require.Error(t, err)
+				assert.False(t, fserrors.IsFatalError(err))
+			})
+			t.Run("on", func(t *testing.T) {
+				err := updateWithReader(t, true, test.err)
+				require.Error(t, err)
+				assert.True(t, fserrors.IsFatalError(err))
+			})
+		})
+	}
+}