[Helpers] Refactor Download File to tmp

[andrewjschuang]

Part of #4094.

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Name	Status	Preview	Updated
pipedream-docs	✅ Ready (Inspect)	Visit Preview	Sep 12, 2022 at 9:46PM (UTC)
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[dylburger]

Thanks for submitting this PR! When we review PRs, we follow the Pipedream component guidelines. If you're not familiar, here's a quick checklist:

• [ ] Create components to address specific use cases whenever possible
• [ ] Component keys should follow the format app_name_slug-slugified-component-name
• [ ] Components should follow the standard directory structure
• [ ] Prefer Node.js client libraries to REST APIs
• [ ] When making API requests, handle pagination to ensure all data / events are processed
• [ ] Use secret props to capture sensitive data
• [ ] Props and methods should be defined in app files whenever possible
• [ ] Document methods with JS Docs
• [ ] Use optional props whenever possible, and set a default value where you can
• [ ] Use async options to accept user input wherever possible

[andrewjschuang]

Hi @michelle0927, can you please review this one too? Thanks!

[andrewjschuang]

Merging as this will be tested with #4094.