[DOCS] Adds feature importance regression example #1360
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Related to elastic/kibana#73561
This PR drafts changes to the regression example such that it includes feature importance explanations.
In particular, it suggests choosing a feature importance value in step 2g then shows an example of a decision plot in the "Viewing regression results" section.
It also updates the destination index names (since by default the index name=job name when you use Kibana) and adds a missing query in the wizard screenshot (which previously only existed in the API version of the example).
Preview
https://stack-docs_1360.docs-preview.app.elstc.co/guide/en/machine-learning/master/flightdata-regression.html