Simplify metadata tag rendering to flat imperative style (#90209)
Replace the layered abstraction (Meta, MetaFilter, MultiMeta,
ExtendMeta, and 12 category component functions across 5 files) with a
single flat function that builds a tags array using explicit if-checks
and for-loops. Every meta/link tag is now visible as literal JSX at the
call site. OG image/video/audio properties and AppLinks fields are
enumerated explicitly rather than iterated generically from object keys.
Keys are assigned directly on each element at push time, eliminating the
cloneElement keying pass.