Scan all modules to validate no uses of `npm:` or `node:`

[NathanFlurry]

Motivation

Modules should use strictly ECMA-compliant modules. Node modules should be pulled from esm.sh.

Implementation

This needs to be done via a dumb grep.

We can't use --no-npm because we depend on pg for Deno targets which can only be served via NPM because if its dependency on libpq.