Normalization is now available in both Hybrid Euler 2S and Distilled Flow
samplers, making the standalone Normalizing sampler redundant. Removes the
node class, its sampler function, two private helpers (_parse_norm_factors,
_apply_av_norm_factors), the Studio/Movie Editor "Normalizing" type option,
and the defaultNormalizing() factory. Stale "same as the Normalizing sampler"
tooltip references in both sampler nodes are updated.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>