Merge branch 'js/default-branch-name-part-4-minus-1'

Adjust tests so that they won't scream when the default initial branch name is changed to 'main'. * js/default-branch-name-part-4-minus-1: t1400: prepare for `main` being default branch name tests: prepare aligned mentions of the default branch name t9902: prepare a test for the upcoming default branch name t3200: prepare for `main` being shorter than `master` t5703: adjust a test case for the upcoming default branch name t6200: adjust suppression pattern to also match "main" tests: start moving to a different default main branch name t9801: use `--` in preparation for default branch rename fmt-merge-msg: also suppress "into main" by default