CI: remove Travis CI support

Remove support for running the CI in travis. The last builds in it are
from 5 months ago[1] (as of 2021-11-19), and our documentation has
referred to GitHub CI instead since f003a91f5c5 (SubmittingPatches:
replace discussion of Travis with GitHub Actions, 2021-07-22).

We'll now run the "t9810 t9816" and tests on OSX. We didn't before, as
we'd carried the Travis exclusion of them forward from
522354d70f4 (Add Travis CI support, 2015-11-27). Let's hope whatever
issue there was with them was either Travis specific, or fixed since
then (I'm not sure).

The "apt-add-repository" invocation (which we were doing in GitHub CI)
isn't needed, it was another Travis-only case that was carried forward
into more general code. See 0f0c51181df (travis-ci: install packages
in 'ci/install-dependencies.sh', 2018-11-01).

Remove the "linux-gcc-4.8" job added in fb9d7431cf4 (travis-ci: build
with GCC 4.8 as well, 2019-07-18), it only ran in Travis CI.

1. https://travis-ci.org/github/git/git/builds

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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