uitest: split up UITest_writer_demo

I used solenv/gbuild/Trace.mk to measure where the time is spent at the
end of an incremental 'make check'. The last 141 seconds is spent
executing UITest_writer_demo alone.

If that test is executed in isolation, it takes 289 seconds. I measured
the cost of all the individual .py suites and arranged them into 8
separate UITests, this way the make -j8 cost is 101 seconds (i.e. 35% of
the baseline). IOW this is supposed to speed up 'make check' with 3m13s,
provided you have the code already built.

Change-Id: I1ffee3a06b8fd84d7b9a0295547900df11f11f68
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/89835
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>

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