fix blocking getcwd on async playwright #3021
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fix: avoid blocking os.getcwd() call in async subprocess creation
asyncio.create_subprocess_exec() internally calls os.getcwd() when the
cwd parameter is not specified. This blocking call causes issues in ASGI
servers that detect and prevent blocking operations on the event loop.
This fix pre-fetches the current working directory using asyncio.to_thread()
and passes it explicitly to create_subprocess_exec(), avoiding the blocking
call during subprocess creation.