environment: move object_creation_mode into repo_config_values

The global variable 'object_creation_mode' controls how Git creates
object files, specifically determining whether to use hardlinks or
renames when moving temporary files into the object database. Move
it into 'struct repo_config_values' to continue the libification
effort.

Move the 'enum object_creation_mode' definition higher up in
'environment.h' to ensure it is visible to the structure. Initialize
the per-repository value to its default macro value
OBJECT_CREATION_MODE inside 'repo_config_values_init()'.

Update configuration parsing in 'git_default_core_config()' to write
directly to the repository-specific configuration structure.

Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Ayush Chandekar <ayu.chandekar@gmail.com>
Mentored-by: Olamide Caleb Bello <belkid98@gmail.com>
Signed-off-by: Tian Yuchen <cat@malon.dev>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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