Declares kind 8 as a third sub-kind under the existing Badges
ExtraKindDef with its own 'showBadgeAwards' / 'feedIncludeBadgeAwards'
toggles. The home feed and profile feed both derive their kinds list
from getEnabledFeedKinds, so both pick up badge awards automatically.
The Badges page's follows feed is a hardcoded list, so kind 8 is added
there explicitly.
Defaults match existing badge settings: enabled in hardcodedConfig (new
users see them), conservative in InitialSyncGate and TestApp. The
ContentSettings UI auto-generates a new Badge Awards toggle row.
Removes the now-redundant KIND_SPECIFIC_LABELS/ICONS entries for kind 8
since the sub-kind carries that metadata.
Alex Gleason
8e6bd29be0