Merge branch 'ob/more-repo-config-values' into jch

* ob/more-repo-config-values:
  env: move "warn_on_object_refname_ambiguity" into `struct repo_config_values`
  env: move "sparse_expect_files_outside_of_patterns" into `repo_config_values`
  env: move "core_sparse_checkout_cone" into `struct repo_config_values`
  environment: move "precomposed_unicode" into `struct repo_config_values`
  environment: move "pack_compression_level" into `struct repo_config_values`
  environment: move `zlib_compression_level` into `struct repo_config_values`
  environment: move "check_stat" into `struct repo_config_values`
  environment: move "trust_ctime" into `struct repo_config_values`