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1f44f4022e
The async handler CI tests fail intermittently because the TCP
connection from the pytest host to the ESP32 HTTP server times out
or gets refused.
Add a _connect_with_retry() helper that retries the TCP connection
up to 3 times with a 2-second delay between attempts, catching
TimeoutError, ConnectionRefusedError, and OSError.
Extract common server startup waiting into _wait_for_server_ready()
which includes a 2-second stabilization delay after the server
registers its URI handlers before tests begin sending requests.
(cherry picked from commit a665e7410c)