node tests: Remove ui_init test.
node tests: Remove ui_init test.

I created this test in Jan 2019 with
6b7a4f86118c558ce574039aee76eae0a7374e01.

At the time I created this we were still migrating modules
over from using the $(() => {...}) style of initialization,
so the test served a purpose as an easy smoke test that we
weren't doing something really stupid in
ui_init.initialize().

Now that that migration is complete, the test's warts start
to outweigh its benefits.  Because it's just a smoke test,
we get credit for artificial line coverage where we're
exercising code without actually verifying anything other
than that it runs without crashing.

There are still possibilities for bugs within
ui_init.initialize() where we initialize modules in the
wrong sequence, but I am not confident that the node test
would catch them with any more likelihood (or clarity) than
either the puppeteer tests or czo bug reports.

And then on top of that, the zjquery setup in the node test
is hard to maintain. It's also hard to verify that some
of the setup isn't cruft.

If you want to see how much of a maintenance headache this
has been in recent times, just look at how many of the
recent commits have been related to things like es6
migrations or code cleanup sweeps.

We should just kill it.

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