SCORU/Node: Print whole log for kernel debug messages

Context

Fixes #4921 (closed).

Kernel logs are now printed in full (instead of being truncated when printed on standard output). This also removes the extra quotes but it does not look like these would be desirable in stdout anyway.

Note that this does not impact other sinks for logging events (like pipes with JSON events for instance).

Manually testing the MR

Run a rollup node with the echo kernel and observe that kernel logs do not contain [...].