[Release] Update CHANGELOGs for M175

[andrewheard]

Updated "Unreleased" CHANGELOG entries for M175 (12.8.0).

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[paulb777]

thinking Levels is showing up in 12.7 instead of 12.8

[andrewheard]

thinking Levels is showing up in 12.7 instead of 12.8

@paulb777 Good catch, updated.