feat(windows): allow open and Bun.file() with /dev/null

[paperclover]

Closes #8359

On windows, opening the exact filename /dev/null, with forward slashes, will open the windows null device.

We should NOT recommend this pattern anywhere and it is ONLY here for compatibility with badly written npm dependencies, should any even exist.

The correct way to write this code is using os.devNull https://nodejs.org/api/os.html#osdevnull

[github-actions]

❌ @paperdave 3 files with test failures on bun-darwin-aarch64:

• test/cli/test/bun-test.test.ts 1 failing
• test/js/node/watch/fs.watchFile.test.ts 1 failing
• test/js/third_party/webpack/webpack.test.ts 1 failing

View test output

^{#1580d94727e9297b08d3ab579a2c125f236bf179}

[github-actions]

❌ @paperdave 3 files with test failures on linux-x64-baseline:

• test/cli/test/bun-test.test.ts 1 failing
• test/integration/next/default-pages-dir/test/next-build.test.ts 1 failing
• test/js/third_party/webpack/webpack.test.ts 1 failing

View test output

^{#1580d94727e9297b08d3ab579a2c125f236bf179}

[github-actions]

❌ @paperdave 3 files with test failures on linux-x64:

• test/cli/test/bun-test.test.ts 1 failing
• test/integration/next/default-pages-dir/test/next-build.test.ts 1 failing
• test/js/third_party/webpack/webpack.test.ts 1 failing

View test output

^{#1580d94727e9297b08d3ab579a2c125f236bf179}

[github-actions]

❌ @paperdave 4 files with test failures on bun-darwin-x64:

• test/cli/test/bun-test.test.ts 2 failing
• test/js/bun/util/which.test.ts 1 failing
• test/js/node/fs/fs.test.ts 1 failing
• test/js/third_party/webpack/webpack.test.ts 1 failing

View test output

^{#1580d94727e9297b08d3ab579a2c125f236bf179}

[github-actions]

❌🪟 @paperdave, there are 7 test regressions on Windows x86_64

• test\bundler\bundler_edgecase.test.ts
• test\bundler\cli.test.ts
• test\cli\inspect\inspect.test.ts
• test\js\bun\util\bun-file-windows.test.ts
• test\js\node\async_hooks\AsyncLocalStorage.test.ts
• test\regression\issue\08095.test.ts
• test\transpiler\template-literal.test.ts

Full Test Output

[paperclover]

TODO: make sure the string in bun.file() does not get freed