fix(whiteboard): isolate font-subsetting workers in production

Maximilian Fußrequested to merge
m.fuss/web-app:3609-backport-whiteboard-set-excalidraw-asset-path-without-an-inline-script-to-v26-3-x-v2-10-x into release/v2.10.x

fix(whiteboard): isolate font-subsetting workers in production

Closes #3552 (closed)

(cherry picked from commit ce5ea831)

Closes #3609 (closed)

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