feat: Add conversion support in GraniteHybrid for non-hybrid (all attn) (#16177)

feat: Add conversion support in GraniteHybrid for non-hybrid (all attn) (#16177)

This is a configuration of the hparams in the GraniteHybrid architecture
that devolves to the Granite (or GraniteMoe) architecture (ie Granite 3.x).
It may be used for some models in the Granite 4 family with the
GraniteHybrid architecture acting as a superset arch. Rather than support
it directly in the c++ graph, we simply coerce the architecture flag back
to the correct "granite" or "granitemoe" architecture.

Branch: gabe-l-hart/GraniteNonHybridConversion

Signed-off-by: Gabe Goodhart <redacted>
Co-authored-by: Sigbjørn Skjæret <redacted>