Set default to rebase for pull
Update error string on auth failure
Improve trace logging
(cherry picked from commit b8225ba2d62e01dd94837d6ddd9570486e7d93b5)
Updates the git connection dialog to reflect default agentic behavior,
followed by default keys and only then reverting to a custom selection
if the user desires
Fixes https://gitlab.com/kicad/code/kicad/-/issues/20204
(cherry picked from commit 2c52f98da46cf5898cdd2b6700ff6d89d606d9e2)
Recommendation is to avoid using the year nomenclature as this
information is already encoded in the git repo. Avoids needing to
repeatly update.
Also updates AUTHORS.txt from current repo with contributor names
