Kernel: fix temporary WORLD_STATE_PATH

What

This MR updates the temporary path of the world state in safe storage, replacing the fixed constant with a dynamic path that prefixes the world state with the temporary (TMP_PATH) directory.

Why

While this change does not impact the current state of the code, it addresses a critical issue when transitioning to a multichain setup. Consider an example with two chains: previously, if the first chain had a small blueprint and the second chain had a larger one, the safe storage could be promoted incorrectly. This happened because the first chain's blueprint finalized, while the second chain’s blueprint required a reboot.

MR !16502 (merged) introduces chain-specific paths by incorporating chain_id, ensuring independent world state paths for different chains. This MR extends that approach to temporary world states, eliminating the risk of promoting an incorrect blueprint.