ide-debug-manager: Prefer breakpoint-at-warnings over breakpoint-at-criticals

Corey Berla requested to merge wip/corey/fatal-warning into main

If both settings breakpoint-at-warnings and breakpoint-at-criticals are enabled, then G_DEBUG=fatal-criticals is used, which doesn't break at warnings. We should use G_DEBUG=fatal-warnings, because that implicitly breaks at criticals. Update the settings schema to more clearly reflect what the settings do.

I considered some sort of binding between the two settings, but the complexity didn't seem worth the benefit (if any).

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