t6429: remove switching aspects of fast-rebase
At the time t6429 was written, merge-ort was still under development, did not have quite as many tests, and certainly was not widely deployed. Since t6429 was exercising some codepaths just a little differently, we thought having them also test the "merge_switch_to_result()" bits of merge-ort was useful even though they weren't intrinsic to the real point of these tests. However, the value provided by doing extra testing of the "merge_switch_to_result()" bits has decreased a bit over time, and it's actively making it harder to refactor `test-tool fast-rebase` into `git replay`, which we are going to do in following commits. Dispense with these bits. Co-authored-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Christian Couder <chriscool@tuxfamily.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>