puppeteer_test: Improve how we select the typeahead element.
puppeteer_test: Improve how we select the typeahead element.

Our typeahead system is very sensitive, a simple internal
focus can hide it. This leads to occasional failure on the
puppeteer test.

This commit tries to solve it by clicking via javascript
instead of manual puppeteer click.

zulip/zulip,andersk/zulip,rht/zulip,rht/zulip,hackerkid/zulip,zulip/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,hackerkid/zulip,eeshangarg/zulip,zulip/zulip,eeshangarg/zulip,kou/zulip,rht/zulip,rht/zulip,eeshangarg/zulip,hackerkid/zulip,kou/zulip,zulip/zulip,kou/zulip,kou/zulip,andersk/zulip,andersk/zulip,hackerkid/zulip,kou/zulip,eeshangarg/zulip,kou/zulip,eeshangarg/zulip,rht/zulip,zulip/zulip,zulip/zulip,andersk/zulip,eeshangarg/zulip,hackerkid/zulip,andersk/zulip,andersk/zulip,andersk/zulip,zulip/zulip,hackerkid/zulip,hackerkid/zulip,rht/zulip