[ML] DF Analytics Results: ensure is_training filtering works as expected

[alvarezmelissa87]

• filter results page for training data (ml.is_training) via the URL
  • [ML]DF Analytics exploration: default filter of results page by defaultIsTraining value in url #78303
    - [ ] In results table for the ml.is_training column values -show boolean values without formatting so it’s intuitive what you’re searching for in the search bar ([ML] DF Analytics results view: ensure boolean values in charts shown without formatting #78888)
    • Currently they show up asTrue - if you then try to filter the table with ml.is_training : True the search fails and we get a fully broken page. Meanwhile ml.is_training : true works as expected.
• Ensure chart tooltip for boolean contains actual true/false instead of 0/1
• Ensure errors due to the filter value don't remove the search bar from the page - give the users a chance to try again.
  • [ML] DF Analytics exploration: ensure search bar still visible when error caused by search bar query #78356
• add quick filters to the right of the search bar for filtering by training
  • [ML] DF Analytics exploration: add ml.is_training filter to regression/classification views #78702
• update functional tests ([ML] DF Analytics results view: ensure boolean values in charts shown without formatting #78888)

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[alvarezmelissa87]

Closing this off and addressing column values in separate PR if needed in addition to EUI update.