[7.x][Transform] enhance the output of preview to return full destination index details #53695
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changes the output format of preview regarding deduced mappings and enhances it to return all the details about auto-index creation. This allows the user to customize the index creation. Using HLRC you can create a index request from the output of the response. Long term this allows us to add UI support, see elastic/kibana#57059 and/or improve setting defaults.
backport #53572