Windows tool_tests_commands flakes on missing Visual Studio toolchain

[christopherfujino]

I introduced a command test that does a real windows build, but the commands shard doesn't specify a dependency on VS. This should be moved to the integration shard.

https://logs.chromium.org/logs/flutter/buildbucket/cr-buildbucket/8766840633390392737/+/u/run_test.dart_for_tool_tests_shard_and_subshard_commands/test_stdout

01:24 +641: test/commands.shard\permeable\build_preview_test.dart: flutter build _preview creates preview device
Exception: Unable to find suitable Visual Studio toolchain. Please run `flutter doctor` for more details.
#0      throwToolExit (package:flutter_tools/src/base/common.dart:10:3)
#1      buildWindows (package:flutter_tools/src/windows/build_windows.dart:88:5)

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