info: Add fields to match remote-info

This adds the Date, Subject and Parent fields that are shown
by remote-info so these match for the fields where it makes sense.

Closes: #1192
Approved by: alexlarsson
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Internal Server Error - Gitea: Git with a cup of tea
500 Internal Server Error

Gitea Version: 1.28.0+dev-477-g8b6ad49a5f