Configure npm distribution mirror and inventory syncing

[colincasey]

Updates the automation workflows to:

• use reusable workflows to reduce duplication of steps
• adds support for npm in the list of distributions to mirror to S3
• adds support for npm for synchronizing inventory.toml updates
• updates the helper binaries used in the automation to support npm

W-13916385

[joshwlewis]

but can we wait to ship this until we get the latest node.js releases out?

Looks like this is already done! Thanks! Looks great!