Update Discover steps on the TriMet tutorial, NLP inference, and upgrade troubleshooting pages for ES|QL mode #9191

Problem

Three pages tell readers to use a data view or a Lucene filter in Discover. {{kib}} now opens Discover in {{esql}} mode by default, where there is no data view menu. Each page needs an {{esql}} path, and each path depends on facts that need checking first.

Pages

• explore-analyze/visualize/maps/asset-tracking-tutorial.md: step 4 tells readers to set the data view to TriMet Positions. An {{esql}} path needs the index name from the tutorial, and the later steps and screenshots show classic mode.
• explore-analyze/machine-learning/nlp/ml-nlp-inference.md: readers must create data views before they explore the pipeline results in Discover. In {{esql}} mode, readers can query the results index directly, so check which part of the step still applies.
• troubleshoot/elasticsearch/troubleshooting-upgrades.md: readers apply a Lucene filter on .monitoring* in Discover on a monitoring cluster. An {{esql}} path needs an equivalent query and a check that Discover reaches those indices on an attached monitoring cluster.

Context

Found while sweeping the docs for Discover steps that assume a data view, as part of #9190.