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tests: remove some unnecessary config

Some of these tests were originally split from a single file that had (and
used) these options, and some of the tests were later created by just
mindlessly copypasting the same set of options that aren't applicable to the
newly written tests.

Things removed by this patch:

- web section from tests that don't use hg serve and don't push
- phases.publish from tests that don't exchange changesets between repos
- diff section from tests that don't have any diffs
- defaults section that sets the date

The defaults section that only adds -d '0 0' to commands should no longer be
necessary because run-tests.py sets devel.default-date='0 0' since 4.3, and all
command in evolve should respect this config option.
8 jobs for topic/default/tests-cleanup in 4 minutes and 27 seconds (queued for 3 seconds)
Status Name Job ID Coverage
  Test
passed checks-py2 #172780

00:01:08

passed checks-py3 #172781

00:02:03

passed doc #172786

00:00:34

manual pytype #172779
allowed to fail manual
passed tests-py2-cext #172782

00:04:27

passed tests-py2-pure #172783

00:04:01

passed tests-py3-cext #172784

00:02:33

passed tests-py3-pure #172785

00:03:57