Smart rollup: add test for bailout mode to make sure bailout can defend their commit

Context

Add a test that make sure a rollup node in bailout mode can defends their previously submitted commitment.

see #5442 (closed)

Manually testing the MR

dune exec tezt/tests/main.exe -- --file sc_rollup.ml --title "Alpha: arith - refutation games winning strategies (bailout_mode_defends_its_commitment)"

Checklist

• Document the interface of any function added or modified (see the coding guidelines)
• Document any change to the user interface, including configuration parameters (see node configuration)
• Provide automatic testing (see the testing guide).
• For new features and bug fixes, add an item in the appropriate changelog (docs/protocols/alpha.rst for the protocol and the environment, CHANGES.rst at the root of the repository for everything else).
• Select suitable reviewers using the Reviewers field below.
• Select as Assignee the next person who should take action on that MR