Backport 4406 / 4397 / 4394 / 4366 to TestNet Conway of end-to-end CI changes.#4739

MathieuDutSik merged 8 commits intolinera-io:testnet_conwaylinera-io/linera-protocol:testnet_conwayfrom

MathieuDutSik:backport_linera_sdk_tests_fixturesMathieuDutSik/linera-protocol_second:backport_linera_sdk_tests_fixturesCopy head branch name to clipboard