[ML] Changing job wizard query to use match_all - #32008

Changes the query used to draw the line charts in the wizards and used in the datafeed to be:

match_all: {}

rather than

query_string: {	   
  analyze_wildcard: true,	
  query: '*'	
}

Also removes the filters object returned from createSearchItems() but which are no longer used.
query and filters are combined to create combinedQuery which is used for every search.
query is only used in the data visualizer page as it requires a lucene query string.

Fixes #31924

Checklist

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- [ ] This was checked for cross-browser compatibility, including a check against IE11
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• Unit or functional tests were updated or added to match the most common scenarios
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- [ ] This was checked for breaking API changes and was labeled appropriately
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