test: align triplet tests with actual plugin behavior

Fixes CI failures from the prior commit's bats additions.
storage report mounts are prefixed with `-v `, logs.bats setup does not
auto-create the test app, the nginx-vhosts shell report emits JSON keys
without the `nginx-` plugin prefix, registry computed-image-repo falls
back to the default `dokku/<app>` repo name when no template is set,
cron computed-maintenance follows OR-not-override semantics so a per-app
`false` does not override a global `true`, the scheduler subcommand
help string is `Manage scheduler settings`, and bringing ps procfile-path
into the #8640 raw convention required updating the pre-existing
`(ps:set) procfile` assertion. Also extends fn-git-keep-git-dir to fall
back through the global property before the built-in default so global
keep-git-dir actually takes effect at deploy time.

plugins/git/internal-functions

@@ -624,8 +624,11 @@ fn-git-keep-git-dir() {
   local DEFAULT_KEEP_GIT_DIR="${2-false}"
 
   local DOKKU_KEEP_GIT_DIR="$(fn-plugin-property-get "git" "$APP" "keep-git-dir" "")"
+  local DOKKU_GLOBAL_KEEP_GIT_DIR="$(fn-plugin-property-get "git" "--global" "keep-git-dir" "")"
   if [[ -n "$DOKKU_KEEP_GIT_DIR" ]]; then
     echo "$DOKKU_KEEP_GIT_DIR"
+  elif [[ -n "$DOKKU_GLOBAL_KEEP_GIT_DIR" ]]; then
+    echo "$DOKKU_GLOBAL_KEEP_GIT_DIR"
   else
     echo "$DEFAULT_KEEP_GIT_DIR"
   fi