[7.7] Ensure that .watcher-history-11* template is in installed prior to use (#56734) #56848
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elastic#56734) WatcherIndexTemplateRegistry as of elastic#52962 requires all nodes to be on 7.7.0 before it allows the version 11 index template to be installed. While in a mixed cluster, nothing prevents Watcher from running on the new host before the all of the nodes are on 7.7.0. This will result in the .watcher-history-11* index without the proper mappings. Without the proper mapping a single document (for a large watch) can exceed the default 1000 field limit and cause error to show in the logs. This commit ensures the same logic for writing to the index is applied as for installing the template. In a mixed cluster, the `10` index template will continue to be written. Only once all of nodes are on 7.7.0+ will the `11` index template be installed and used. closes elastic#56732
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Backports the following commits to 7.7: