[io] copyPath/copyPathSync: expose parameter `followLinks` #348

Job	Run time
health / coverage / run coverage health check	1m 30s
health / changelog / run changelog health check	1m 11s
health / breaking / run breaking health check	1m 17s
health / do-not-submit / run do-not-submit health check	1m 17s
health / license / run license health check	1m 8s
health / leaking / run leaking health check	1m 6s
health / comment	6s
	7m 35s

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