### Description
the `npm test` flags are difficult to memorize, because they are
different to the `ort.env` flags. This change makes those flags align
with ort JS API. eg. `--wasm-enable-proxy` became `--wasm.proxy`.
Old flags are marked as deprecated except `-x` (as a shortcut of
`--wasm.numThreads`)
1. Upgrade nodejs from 16.x to 18.x for Windows pipelines
2. Avoid using Azure DevOps "NodeTool" on Linux. The tool installs
nodejs from internet or local disk cache. But we already moved all Linux
tests to docker. So we do not need the installer anymore.
3. Remove some other unused code.
