add issue_tracker links to pubspec files #356

Job	Run time
health / do-not-submit / run do-not-submit health check	1m 11s
health / do-not-submit / run do-not-submit health check	1m 13s
health / coverage / run coverage health check	1m 11s
health / coverage / run coverage health check	1m 9s
health / breaking / run breaking health check	4m 3s
health / breaking / run breaking health check	4m 22s
health / changelog / run changelog health check	48s
health / changelog / run changelog health check	52s
health / leaking / run leaking health check	3m 3s
health / leaking / run leaking health check	3m 1s
health / license / run license health check	1m 16s
health / license / run license health check	1m 7s
health / comment	3s
health / comment	8s
	23m 27s

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