[ML] Rename Index pattern to Data view

[peteharverson]

Part of #100844

Index patterns (the kibana saved object ones) are being renamed to data views, so all user facing 'index pattern' text content needs to be edited to 'data views'.

Work on the following plugins will be tracked in this meta issue:

• ml [ML] Updates index pattern to data view in user facing copy #112984
• transform [ML] Transforms: Updates index pattern to data view in user facing copy #112824
• file_upload (changes made in [Maps] 'index patter' -> 'data view' in user facing copy #110701)
• data_visualizer [ML] Data Visualizer: index pattern to data view in user facing copy #114258

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[peteharverson]

Closing issue as the renaming is now complete for all the plugins managed by the ml-ui team.