SCORU: add Tezt tests for timeouts

Context

Answers #3295 (closed).

The added test focuses on adding gas consumption traces for the timeout command.

For functional tests, see lib_protocol/tests/integration/operations/test_sc_rollup.ml.

Manually testing the MR

The goal is to be able to detect changes in gas consumption, so apply this patch on the branch:

diff --git a/src/proto_alpha/lib_protocol/sc_rollup_refutation_storage.ml b/src/proto_alpha/lib_protocol/sc_rollup_refutation_storage.ml
index 33403e15db..c15c99ab4a 100644
--- a/src/proto_alpha/lib_protocol/sc_rollup_refutation_storage.ml
+++ b/src/proto_alpha/lib_protocol/sc_rollup_refutation_storage.ml
@@ -305,6 +305,7 @@ let get_timeout ctxt rollup stakers =
 
 let timeout ctxt rollup stakers =
   let open Lwt_tzresult_syntax in
+  let*? ctxt = Raw_context.consume_gas ctxt (Saturation_repr.safe_int 10_000) in
   let level = (Raw_context.current_level ctxt).level in
   let* game, ctxt = get_game ctxt rollup stakers in
   let* ctxt, timeout = Store.Game_timeout.get (ctxt, rollup) stakers in

leads to changes in regression traces when running:

dune exec tezt/tests/main.exe -- --file sc_rollup.ml --title "Alpha: refutation game timeout" --reset-regressions

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