fix: ensure --build-output destination exists (#45182)

Summary:
Replicates https://github.com/react-native-community/cli/commit/48d4c29bba4e8b16cbc8307bd1b4c5349f3651d8, which landed inside `cli-plugin-metro` inside RNC CLI, but because of migration of code to `community-cli-plugin` it looks like apparently the fix wasn't replicated.

## Changelog:

[GENERAL] [FIXED] - Ensure `--build-output` destination exists

Pull Request resolved: https://github.com/facebook/react-native/pull/45182

Test Plan:
Specify a new directory that doesn't exists inside `--build-output`:

`npx react-native bundle --build-output dist/new-dir/index.bundle`

and this command shouldn't fail.

Reviewed By: christophpurrer

Differential Revision: D61850942

Pulled By: huntie

fbshipit-source-id: 90e57f19c661ace8206162d6fa2e6a27acb31e20

packages/community-cli-plugin/src/commands/bundle/buildBundle.js

@@ -18,6 +18,7 @@ import {logger} from '../../utils/logger';
 import parseKeyValueParamArray from '../../utils/parseKeyValueParamArray';
 import saveAssets from './saveAssets';
 import chalk from 'chalk';
+import {promises as fs} from 'fs';
 import Server from 'metro/src/Server';
 import metroBundle from 'metro/src/shared/output/bundle';
 import metroRamBundle from 'metro/src/shared/output/RamBundle';
@@ -112,6 +113,12 @@ async function buildBundleWithConfig(
   try {
     const bundle = await bundleImpl.build(server, requestOpts);
 
+    // Ensure destination directory exists before saving the bundle
+    await fs.mkdir(path.dirname(args.bundleOutput), {
+      recursive: true,
+      mode: 0o755,
+    });
+
     // $FlowIgnore[class-object-subtyping]
     // $FlowIgnore[incompatible-call]
     // $FlowIgnore[prop-missing]