Description of problem:

Starting with backstage release 1.24.0, the use of ts-node to manage the typescript compilation has been replaced by the use of the @backstage/cli/config/nodeTransform.cjs script based on pirates and @swc/core  NPM packages (see commit 2c2f705fe169f72fdac4da84c154d7118598d06f).

We should adapt to this in the the validation of the entrypoints part of the Janus CLI export-dynamic-plugin command new implementation for backend plugins.