git: move credential helpers to exec path

Currently if the credential helpers packaged with git aren't on your
PATH, git will fail to locate them. This most notably affects git
maintanence[1] which generates systemd units / launchd agents that
invoke git directly without setting PATH. Home Manager is also able to
generate maintanence units for systemd and does not set PATH[2], meaning
credential helpers will not work without additional configuration.

Moving the credential helpers to git's exec path[3] allows git to locate
them regardless of how PATH is set, and matches the packaging of
Fedora[4] and Homebrew[5]. Typically credential helpers are not added to
PATH unless they are provided by another package separate from git (e.g.
git-credential-gcloud).

I opted to create symlinks at the old bin paths in case some users were
relying on invoking them directly. In practice I doubt this is done
much. If we want to slim down git's bin dir I think the symlinks could
be removed, and in doing so we'd better match the packaging done in
other distributions.

[1]: https://git-scm.com/docs/git-maintenance/2.47.1
[2]: https://github.com/nix-community/home-manager/blob/b6fd653ef8fbeccfd4958650757e91767a65506d/modules/programs/git.nix#L619
[3]: https://git-scm.com/docs/git/2.47.1#Documentation/git.txt---exec-pathltpathgt
[4]: https://src.fedoraproject.org/rpms/git/blob/rawhide/f/git.spec#_651
[5]: https://github.com/Homebrew/homebrew-core/blob/12120ff79ce009489b958d8271af686d74403859/Formula/g/git.rb#L112

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