Ensure light-client can be bundled nodejs crypto free

`light-client` [bundle](https://github.com/ChainSafe/lodestar/pull/6673) strips `node:crypto`, assuming it's not used at runtime.
A saner approach would be to ensure it's not bundled indirectly via dependencies.

Start by reviewing the light-client bundle and pull request #6673 to understand how node:crypto is currently stripped. Trace the bundle's dependencies to find indirect inclusion of node:crypto, then verify that the resulting light-client bundle remains free of it and still works at runtime.

Written by the indexing model from the issue text.