test: use backwards_compatible_rs_contract
where appropriate
#9175
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rs_contract
can be used by tests that run only on the latestprotocol version, as defined by the const PROTOCOL_VERSION.
backwards_compatible_rs_contract
must be used in backwardscompatibility tests that rely on specific protocol versions.
This is a pre-requisite to land the rustc 1.70 toolchain upgrade.
(See also #9140)