Move git user configuration to create_dot_gitconfig.local.tmpl

This removes the user name and email from `dot_gitconfig.tmpl` (leaving
only `useConfigOnly = true` under the `[user]` section) and adds the
templated name and email into `create_dot_gitconfig.local.tmpl`.
This ensures user configurations are correctly managed locally.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

Author: arran4

create_dot_gitconfig.local.tmpl

@@ -1,3 +1,3 @@
 [user]
-  # name = Local User
-  # email = local.user@example.com
+  name = {{ index . "gitUserName" }}
+  email = {{ index . "gitUserEmail" }}

dot_gitconfig.tmpl

@@ -5,8 +5,6 @@
 {{- $pagerTool := index . "gitPagerLocation" -}}
 
 [user]
-  name = {{ index . "gitUserName" }}
-  email = {{ index . "gitUserEmail" }}
   useConfigOnly = true
 [init]
   defaultBranch = main