[8.x] Truncate step_info and error reason in ILM execution state and history (#125054) #125140
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elastic#125054) This commit adds a limit to the `step_info` contained in `LifecycleExcutionState` so that large step info messages will not be stored in the cluster state. Additionally, when generating an ILM history failure, the full exception that is "stringified" is truncated to the same limit, ensuring that we do not accidentally index gigantic documents in the history store. The default limit is 1024 characters. Resolves elastic#124181
dakrone added :Data Management/ILM+SLM 
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Backports the following commits to 8.x: