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Look up the validation error format once per response (#3051)

ValidationErrors#full_messages called I18n.translate(:format, ...) for
every message, and translated a param's display names again for each
of its errors. The template and the names are the same each time, and
an I18n call costs 1.7-3.9 us even on a hit: key normalization, a tree
walk, option filtering and a regexp scan before it interpolates.

Look the template up once, translate each group's names once, and
interpolate each message with I18n.interpolate, the call I18n's backend
ends in for a String entry, so the messages are unchanged.

400 with 5 bad params: +12-13% interpreter, +13-15% YJIT. With one bad
param there is a single lookup either way, so it is unchanged.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

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