Add proguard endpoint in sentry-server test #246

Job	Run time
cli-integration (macos)	2m 16s
cli-integration (windows)	38s
cli-integration (ubuntu)	13s
updater-test-args / validate-inputs	8s
updater-create-pr / cancel-previous-run	5s
updater-create-pr / validate-inputs	9s
updater-test-args / cancel-previous-run	3s
updater-test-args / update	10s
updater-create-pr / update	28s
updater-test-outputs	4s
	4m 14s

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