Allow to query product types by discount condition id

Editor assessment

feat(medusa) is a strong header: the scope pinpoints the package in a multi-module monorepo, and 'query product types by discount condition id' names the exact new capability — precisely what a minor-bump changelog entry needs. Two blemishes: the capitalized 'Allow' breaks the lowercase convention, and 'Allow to query' is unidiomatic English ('Allow querying' reads better). At roughly seventy-six characters the subject slightly exceeds the truncation-safe zone. No body follows, so the API shape — parameters, response, auth requirements — must be mined from the diff, a real documentation gap for a developer-facing query feature. Otherwise clean.