Merge branch 'ps/commit-graph-wo-globals'

Remove dependency on the_repository and other globals from the commit-graph code, and other changes unrelated to de-globaling. * ps/commit-graph-wo-globals: commit-graph: stop passing in redundant repository commit-graph: stop using `the_repository` commit-graph: stop using `the_hash_algo` commit-graph: refactor `parse_commit_graph()` to take a repository commit-graph: store the hash algorithm instead of its length commit-graph: stop using `the_hash_algo` via macros