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Skip run_filters and instrumentation on empty filter lists (#2685)

Grape::Endpoint#run_filters now short-circuits when the filter list is
empty (nil or []), so no work is done and no endpoint_run_filters.grape
notification is emitted for phases without registered filters.

Previously each of :before, :before_validation, :after_validation, :after,
and :finally emitted an event on every request regardless of whether any
filters were registered for that phase, allocating a payload hash and
entering ActiveSupport::Notifications for a no-op.

Updates the instrumentation spec to expect only the phases that actually
run, adds an upgrade note, and a CHANGELOG entry.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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