t7900: adapt some tests to use a throwaway repository

Many of the tests in t7900 operate inside the main trash repository
that's set up by default by our test suite. This is overall quite
fragile as we're exercising repository maintenance in those tests, and
maintenance is of course intricately tied towards the on-disk state of a
repository. Consequently, the tests can easily impact one another.

Furthermore, in the next commit we'll have to modify the environment in
a handful of those tests. As tests don't run in a subshell, doing so
would impact all subsequent tests by default, as well.

Adapt exactly those tests to use a throwaway repository. This makes the
tests more neatly self-contained and allows us to trivially modify the
environment in the next commit.

Note that we adapt calls to `test_config ()` to use git-config(1)
instead. This is because on the one hand we don't need the auto-revert
logic of `test_config ()` as we're using a throwaway repository anyway.
On the other hand it's not possible to use `test_config ()` as it uses
`test_when_finished ()`, which errors out when we run it in a subshell.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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