[PATCH v3 0/8] repo_config_values: migrate more globals

This series continues the effort to remove repository-dependent global configuration state by moving several core.* configuration variables into struct `repo_config_values`.

This ensures configuration values are tied to the repository from which they were read, avoiding cross-repository state leakage in processes handling multiple repositories, while preserving existing behavior.

All affected configuration values are eagerly parsed. Storing them in repo_config_values preserves current semantics and avoids introducing lazy parsing into runtime code paths.

This v3 addresses review feedback by explicitly clarifying the reason these values belong in repo_config_values (eager parsing) and improving commit message clarity.

Olamide Caleb Bello (8):
  environment: move "trust_ctime" into struct repo_config_values
  environment: move "check_stat" into struct repo_config_values
  environment: move "zlib_compression_level" into repo_config_values
  environment: move "pack_compression_level" into struct repo_config_values
  environment: move "precomposed_unicode" into struct repo_config_values
  env: move "core_sparse_checkout_cone" into repo_config_values
  env: put "sparse_expect_files_outside_of_patterns" in repo_config_values
  env: move "warn_on_object_refname_ambiguity" into repo_config_values