i#7756 switch reason: Measure swap-outs in schedule_stats #7762
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Refactors schedule_stats context switch statistics to measure swap-outs instead of swap-ins. This is needed to identify the reason at the swap-out point for the forthcoming switch reason diagnostics and switch histogram per thread features.
Updates the unit tests.
Tested at higher verbosity on threadsig as well.
Issue: #7756, #7759