Merge branch 'ps/setup-centralize-odb-creation' into ps/setup-drop-global-state

* ps/setup-centralize-odb-creation: setup: construct object database in `apply_repository_format()` repository: stop reading loose object map twice on repo init setup: stop initializing object database without repository setup: stop creating the object database in `setup_git_env()` repository: stop initializing the object database in `repo_set_gitdir()` setup: deduplicate logic to apply repository format setup: drop `setup_git_env()` t0001: plug test gaps for git-init(1) with GIT_OBJECT_DIRECTORY