tooling: Add --loop option to test-js-with-puppeteer.
tooling: Add --loop option to test-js-with-puppeteer.

rht/zulip,rht/zulip,kou/zulip,kou/zulip,andersk/zulip,andersk/zulip,andersk/zulip,kou/zulip,andersk/zulip,zulip/zulip,rht/zulip,kou/zulip,andersk/zulip,kou/zulip,andersk/zulip,rht/zulip,zulip/zulip,zulip/zulip,rht/zulip,zulip/zulip,kou/zulip,rht/zulip,zulip/zulip,andersk/zulip,zulip/zulip,kou/zulip,rht/zulip,zulip/zulip