Description of problem:

Wen run with `npx` the `janus-idp/cli` `export-dynamic-plugin --embed-as-dependencies` command fails at validating that the required entrypoints are there.
This is due to the fact that `npx` runs the command from some cache folder, and not from the source repository context, so that `ts-node` is not registered and the typescript `backstage` dependencies present in the validated plugins sources cannot be imported.