Run tests in CI for Node 18, 20, 22

[taras]

Motivation

I found a bug when running Effection v4 in Node 18 that was not there in Node 20. I tracked it to toReversed. I wanted to fix it but I found that we don't actually run tests in Node.

Approach

1. Run tests in Node in CI for 18, 20, and 22.
2. I had to replace useCommand with tinyexec because Deno.Command doesn't have a shim for Node.

[cowboyd]

This is a major enhancement in our coverage, awesome!

Since we now are running the full test suite including maint.test.ts in NodeJS, I think we can get rid of the test:node task in deno.json and the corresponding .mjs file which just ensured that the main() function worked, but nothing else.

[taras]

@cowboyd Repurposed node:test but I removed the node.mjs file.