test: add mustCall for parallel/test-net-connect-paused-connection

Add common.mustCall test on net.createServer callback and listen
callback in the parallel/test-net-connect-paused-connection

remove the mustCall of net.createServer callback

PR-URL: https://github.com/nodejs/node/pull/27463


Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Weijia Wang <starkwang@126.com>
Reviewed-By: Yorkie Liu <yorkiefixer@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Ouyang Yadong <oyydoibh@gmail.com>