fix: stop exposing production source maps publicly

Maximilian Fußrequested to merge
m.fuss/web-app:3390-backport-unauthenticated-production-java-script-source-map-exposes-frontend-source-code-to-v2-7-x into release/v2.7.x

fix: stop exposing production source maps publicly

(cherry picked from commit 09cf9abc)

Closes #3390 (closed)

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