17 bzlformat_lint_tests fail on windows with 'buildifier command not found'

bazel --windows_enable_symlinks test //tools:bzlformat_lint_test --enable_runfiles
```
Executing tests from //tools:bzlformat_lint_test
-----------------------------------------------------------------------------
D:\udu\b\azrngxdp\execroot\_main\bazel-out\x64_windows-fastbuild\bin\tools\bzlformat_lint_test.bat.runfiles\cgrindel_bazel_starlib~\bzlformat\tools\buildifier: line 99: : command not found
tools/bzlformat_lint_test_BUILD.bazel.sh failed with 127.
1 lint tests failed.
```

The fix is to add a direct dependency to buildifier_prebuilt to MODULE.bazel. It is not clear to me why this is required; the same dependency is declared in cgrindel_bazel_starlib.

```
# not a direct dependency, but required here for bazel starlib's difftest macros to work
bazel_dep(
name = "buildifier_prebuilt",
version = "6.1.2",
)
```

Start with MODULE.bazel and reproduce the failure using bazel --windows_enable_symlinks test //tools:bzlformat_lint_test --enable_runfiles. Check the dependency relationship with cgrindel_bazel_starlib and buildifier_prebuilt, then confirm that the Windows bzlformat lint tests pass and no longer report buildifier command not found.

Written by the indexing model from the issue text.