Prompt to choose different port if :8000 is already in use #25016
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Should resolve #24854 by moving the "detect if port is in use and prompt to choose different one" logic to the parent process.
As the develop process now runs on a random unused port anyway, this code path is irrelevant for it. However, the proxy now listens at
:8000
(or the user-selected port) so we need it to detect and prompt instead.