Warn when leaving an insight with unsaved state

[macobo]

Is your feature request related to a problem?

Currently when you edit an insight, it's possible to leave the page in the middle of editing e.g. an insight name. All changes are thereupon lost.

Given user needs to manually "confirm" every change for titles, this can lead to annoying back-and-forth.

Describe the solution you'd like

window.confirm or equivelent

Describe alternatives you've considered

Autosaving titles

Additional context

cc @paolodamico @clarkus

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