test: move test-http-client-timeout-option-with-agent to sequential

The timeout event cannot be precisely timed and the actual timeout may be longer in some situations. Here we move this test into the sequential folder to make it happens less likely. PR-URL: #22083Fixes: #22041 Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Rich Trott <[email protected]> Reviewed-By: Ruben Bridgewater <[email protected]> Reviewed-By: George Adams <[email protected]>

Author: oyyd