Align media comment payload with app fields

[subzeroid]

Summary:

• Reuse the generated media comment idempotence token as comment_creation_key.
• Send include_e2ee_mentioned_user_list and include_media_code with media_comment().
• Extend regression coverage for the app-like comment payload fields.

Scope:

• This is a focused payload alignment for the main media/%s/comment/ request.
• It does not add automatic preflight or speculative side-effect requests.

Validation:

• .venv/bin/pytest -q tests/regression/test_comments.py
• .venv/bin/ruff check instagrapi/mixins/comment.py tests/regression/test_comments.py
• PYTHONUNBUFFERED=1 gtimeout 300 .venv/bin/pytest -q -s tests/live/test_comments.py::ClientCommentExtendTestCase::test_media_comment -> passed, 2 warnings

Refs #2606