GitLab

* Fix the format of mgsm zh and ja.

* Add change log to mgsm.

* Add newline after changelog.

* fix the issue #1391, wrong contexts in mgsm tasks

* fix yaml issue for having two target_delimiter lines. For COT tasks, keep the one with a space (default)

* regenerate all task yaml files
- change naming so that file name will match with task name
- task|file follows a consistent naming way, mgsm_(mode)_(lang) for three modes, i.e., direct, en_cot, and native_cot

* English CoTs should have a space as target_delimiter

* Update utils.py

* Apply suggestions from code review

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Co-authored-by: Hailey Schoelkopf <65563625+haileyschoelkopf@users.noreply.github.com>