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Fail runServer quickly if the port is not available
Summary: Adds an early check that the Metro server port is available before trying to set up the bundler. This allows integrators to give faster feedback to the user in this case. Changelog: * **Fix**: Fail `runServer` quickly if the port is not available. Reviewed By: GijsWeterings Differential Revision: D35849394 fbshipit-source-id: ea01c47a0ff78783670113ede6d8e86b05e76b1e
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