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

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