non-awaited async calls

> You may have noticed the build is failing on a flaky tests.
I found the issue coming from a non-awaited async call.
>
> Therefore I have activated the "@typescript-eslint/no-floating-promises": "warn", as rules.
>
> This rule allow me to easily find the issue.
>
> (we have 100 places where un-awaited promised functions call are missing catches, I only fixed in binding-opcua ) for the time being.

_Originally posted by @erossignon in https://github.com/eclipse-thingweb/node-wot/issues/1424#issuecomment-3332339177_