New: Authentication is now required

(cherry picked from commit d3018fb5015af26a897281f0e892b706cdb6e821)

Closes #1807
Closes #2878
Closes #2873
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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