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)
- Utilize scoped deletion for individual git_*_free() calls
- Protect against multiple usage when updating icons
- Reduce frequency of git update calls
(cherry picked from commit 26c331a83704bcc1f221e67fe6757a07dc9e920b)
Don't keep passwords in plain text config files that may be checked into
version control. Passwords stored in system-specific password managers
Fixes https://gitlab.com/kicad/code/kicad/-/issues/18053
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
