blockifier_test_utils: add test_contract2 cairo0 contract

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• starknet_os_flow_tests: change FlowTestTx to enum #9501
• starknet_os_flow_tests: migrate test_v1_bound_accounts_cairo1 #9496
• starknet_os_flow_tests: add V1-bound cairo1 account for flow tests #9495
• starknet_api: fix compiler->SNAPI contract class ABI string conversion for tests #9494
• starknet_os_flow_tests: migrate test_v1_bound_accounts_cairo0 #9493
• starknet_os_flow_tests: split get_class_info_of_cairo0_contract into function #9492
• starknet_os_flow_tests: more informative execution failure #9491
• starknet_os_flow_tests: add V1-bound cairo0 account for flow tests #9490
• starknet_os_flow_tests: localize expected storage updates in test_os_logic #9485
• starknet_os_flow_tests: migrate test_os_logic and some small refactors #9484
• blockifier_test_utils: add functionality to test contract for test_os_logic #9483
• blockifier_test_utils: add test_contract2 cairo0 contract #9482 👈 (View in Graphite)
• blockifier_test_utils: add delegate_proxy cairo0 contract #9481
• starknet_os_flow_tests: add control for expected reverting txs #9480
• starknet_os_flow_tests: migrate test_reverted_l1_handler_tx #9474
• starknet_os_flow_tests: migrate test_reverted_invoke_tx #9473
• starknet_os_flow_tests: reduce boilerplate with perform_default_validations #9472
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