feat(storage): add compose file sample with deleteSourceObjects

[nidhiii-27]

Add composeFile.js sample and its corresponding tests in system-test/files.test.js.

[gemini-code-assist]

Code Review

This pull request introduces a new script storage/composeFile.js to compose multiple files in a Google Cloud Storage bucket, along with corresponding system tests in storage/system-test/files.test.js. Feedback on the changes suggests improving the robustness of command-line argument parsing by converting the boolean string to lowercase, and optimizing the test cleanup phase by deleting temporary files in parallel using Promise.all.

[gemini-code-assist]

To make the command-line argument parsing more robust, consider converting the string representation of deleteSourceObjects to lowercase. This ensures that inputs like 'TRUE' or 'True' are correctly parsed as true.

Suggested change

	const shouldDelete = String(deleteSourceObjects) === 'true';
	const shouldDelete = String(deleteSourceObjects).toLowerCase() === 'true';

[gemini-code-assist]

To improve test execution speed, perform the cleanup of the source and destination files in parallel using Promise.all instead of sequentially awaiting each deletion.

    afterEach(async () => {
      await Promise.all([
        bucket.file(firstFile).delete().catch(() => {}),
        bucket.file(secondFile).delete().catch(() => {}),
        bucket.file(destinationFile).delete().catch(() => {}),
      ]);
    });