Refactor status order

[mxdvl]

What?

Refactor latestStatusFrom function, so it leverages the existing compareStatuses function.

Why?

Code reuse and simplification: there is now one source of truth for comparing statuses. Follow-up on #679

Tested by running the following manual tests:

console.assert(latestStatusFrom(['alpha', 'stable']) === 'stable')
console.assert(latestStatusFrom(['stable', 'alpha']) === 'stable')
console.assert(latestStatusFrom(['nope', 'invalid']) === null)

Note that v18 of Node and later come bundled with a test runner. See #681 for upgrade.

[camertron]

Nice, thank you!