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: https://github.com/nodejs/node/pull/22083
Fixes: https://github.com/nodejs/node/issues/22041


Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: George Adams <george.adams@uk.ibm.com>