refactor: remove node-fetch [#1550]

A fly-by MR as I just noticed we use node-fetch in our xtm scripts, however since we updated to node 18 we don't need this dependency as it supports native fetch. One of node-fetch goals is to be feature equivalent with the browser spec so we can safely remove the package and require and do not touch our code, easy win!

As for QA, only thing we need to check is that the XTM jobs are still running as expected.