[ML] Remove export* syntax from plugin index files

[spalger]

See #57370 for reasoning, but the gist is that export * usage leads to unexpected and excessive exports from the plugin, leading the public API to grow and increasing the cost of maintaining backwards compatibility.

#109357 implements an ESLint rule to check for this that also assists in fixing the rule, though the auto-fix is imperfect and will require some manual review before committing.

Please remove the /* eslint-disable @kbn/eslint/no_export_all */ comment(s) added in #109357 from the relevant files, validate the auto-fix, remove unnecessary exports, and then submit a PR. Thank you!

Hint: You can search for the URL of this issue to find specific occurrences

• ML Plugin [ML] Remove export wildcard syntax for ML plugin. #123177
• File Upload Plugin [ML] Remove export wildcard syntax for file upload plugin. #123205
• Data Visualizer Plugin [ML] Remove export wildcard syntax for data visualizer plugin. #123213
• Transform plugin (no * exports)

[elasticmachine]

Pinging @elastic/ml-ui (:ml)