t: silence output from `test_create_repo()`
There are a couple users of `test_create_repo()` that use this function outside of any test case. This function is nowadays only a thin wrapper around `git init`, which by default prints a message to stdout that the repository has been initialized. The resulting output may thus confuse TAP parsers. Refactor these users to instead create the repository in a "setup" test case so that we don't explicitly have to silence them. There's one exception in t1007: we use `push_repo()` and its `pop_repo()` equivalent multiple times, so to reduce the noise introduced by this patch we instead silence this invocation. While at it, convert callsites to use git-init(1) directly as the `test_create_repo()` function has been deprecated in f0d4d398e28 (test-lib: split up and deprecate test_create_repo(), 2021-05-10). Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>