fix wrong truncation on fs.writeFileSync with fd argument

[gvilums]

What does this PR do?

Makes it so that using writeFile and writeFileSync with a file descriptor as an argument doesn't truncate the file after every write.

Fixes #10219
Fixes #10222

How did you verify your code works?

Added a test

[github-actions]

❌ @autofix-ci[bot] 2 files with test failures on linux-x64-baseline:

• test/integration/next-pages/test/dev-server.test.ts 1 failing
• test/integration/next-pages/test/next-build.test.ts 1 failing

View test output

^{#10db46ac4d86518e13a3ed28bc8f616b440e9d64}

[github-actions]

❌ @autofix-ci[bot] 5 files with test failures on linux-x64:

• test/integration/mysql2/mysql2.test.ts 6 failing
• test/integration/next-pages/test/dev-server.test.ts 1 failing
• test/integration/next-pages/test/next-build.test.ts 1 failing
• test/js/node/child_process/child_process-node.test.js 1 failing
• test/js/node/watch/fs.watchFile.test.ts 1 failing

View test output

^{#10db46ac4d86518e13a3ed28bc8f616b440e9d64}

[github-actions]

❌ @autofix-ci[bot] 1 files with test failures on bun-darwin-aarch64:

• test/js/bun/http/serve.test.ts 4 failing

View test output

^{#10db46ac4d86518e13a3ed28bc8f616b440e9d64}

[github-actions]

❌ @autofix-ci[bot] 10 files with test failures on bun-windows-x86_64-haswell

• test\cli\install\bunx.test.ts 1 failing
• test\cli\install\registry\bun-install-registry.test.ts 20 failing
• test\integration\next-pages\test\dev-server-ssr-100.test.ts 1 failing
• test\integration\next-pages\test\dev-server.test.ts 1 failing
• test\integration\next-pages\test\next-build.test.ts 1 failing
• test\js\bun\shell\bunshell.test.ts 2 failing
• test\js\node\async_hooks\AsyncLocalStorage.test.ts STATUS_STACK_BUFFER_OVERRUN
• test\js\node\dns\node-dns.test.js 2 failing
• test\js\node\fs\fs.test.ts 1 failing
• test\js\third_party\esbuild\esbuild-child_process.test.ts 1 failing

View test output

^{#10db46ac4d86518e13a3ed28bc8f616b440e9d64}

[github-actions]

❌ @autofix-ci[bot] 3 files with test failures on bun-darwin-x64:

• test/cli/install/registry/bun-install-registry.test.ts 2 failing
• test/js/bun/spawn/spawn.test.ts SIGTERM
• test/js/node/http2/node-http2.test.js 1 failing

View test output

^{#10db46ac4d86518e13a3ed28bc8f616b440e9d64}