Merge branch 'js/test-initial-branch-override-cleanup'

Many tests that used to need GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME mechanism to force "git" to use 'master' as the default name for the initial branch no longer need it; the use of the mechanism from them have been removed. * js/test-initial-branch-override-cleanup: tests: set GIT_TEST_DEFAULT_INITIAL_BRANCH_NAME only when needed