[Fleet] Roll over data streams when toggling experimental indexing features

[kpollich]

When an experimental indexing feature is toggled on or off from the experimental indexing settings section of the integration policy editor, Fleet should automatically roll over the associated data streams.

Additionally, we should display a note in the UI that Fleet will be performing a rollover when these settings are changed.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[ruflin]

As Fleet already has the permissions to do the rollovers, I would expect that Fleet automatically does the rollover. Still a note that it will trigger a rollover would be useful.

[kpollich]

Thanks @ruflin - updated title/description to match expectations that Fleet should handle this.

[kpollich]

I've updated this issue to more broadly capture the need for automated rollovers across all of our experimental indexing settings.