Figure out the preconditions behind runNodeCommandAsJob

[sodic]

We often use the runNodeCommandAsJob function to run npx and npm commands.

The only node-specific thing about runNodeCommandAsJob is that it checks whether node is installed and in PATH. It doesn't check for npm or npx.

We use runNodeCommandAsJob in three ways:

1. We mostly use it to run npm commands.
2. Sometimes, we use it to run npx commands.
3. In one place, we use it to run a JS script directly (I believe for Prisma).

The first two use case require npm and npx. Theoretically, only the third use case requires node (although, in reality, most NPM scripts require node anyway).

We think npm and npx come together with node (but it's still possible that the user doesn't have all of them in PATH).

We should:

1. Make sure we know what the function checks for and what it needs.
2. Update the function's name accordingly.

This is where the discussion started: #2276 (comment)