Remove default_ft_decoding_version

From discussing with @sstahl and @rmatev the use of default_ft_decoding_version shouldn't be necessary any more.

added RTA label

assigned to @cburr

/ci-test

added ci-test-triggered label

• [2022-09-05 18:45] Validation started with lhcb-master-mr#5577

added cleanup label

assigned to @rmatev

changed the description

resolved all threads

merged

mentioned in commit f37dd62b

mentioned in issue Moore#478 (closed)