[3.12] gh-108303: Move config parser data to `Lib/test/configparserdata/` (gh-111879) (gh-111882)

gh-108303: Move config parser data to `Lib/test/configparserdata/` (gh-111879)
(cherry picked from commit cc18b886a51672c59622837a2b8e83bf6be28c58)

Co-authored-by: Nikita Sobolev <mail@sobolevn.me>