SCORU/Node: prevent rollup node from being run with another node data-dir

Context

Fixes #4719 (closed).

This MR makes the rollup node store the rollup address for which it was run in the context. This information is used at startup to prevent a rollup node to be run with another rollup node "data dir" directory.

Manually testing the MR

 dune exec tezt/tests/main.exe -- -f sc_rollup.ml configuration