[v26.1.x] config/tx: have reasonable defaults for idempotency/tx configurations.#30083

bharathv merged 1 commit intoredpanda-data:v26.1.xredpanda-data/redpanda:v26.1.xfrom

vbotbuildovich:backport-pr-30058-v26.1.x-438vbotbuildovich/redpanda:backport-pr-30058-v26.1.x-438Copy head branch name to clipboard