[ML] Switch file data visualizer to use new file upload plugin for data import

[peteharverson]

Once the new file upload plugin is available (see #32945), the ML file data visualizer should be switched over to using the new plugin for importing of data into ES.

• Switch file data visualizer over to using endpoint in new file upload plugin
• Remove ML file data visualizer import endpoint /api/ml/file_data_visualizer/import
• Remove x-pack/plugins/ml/server/models/file_data_visualizer/import_data.js
• Ensure telemetry data is being recorded to track usage of indexes created by ML file data visualizer

[elasticmachine]

Pinging @elastic/ml-ui

[jgowdyelastic]

Depends on #42114

[peteharverson]

Closing as the import route used by the file data visualizer has been moved to the file_upload plugin in #89640 for 7.12.0.