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.

tests/unit/registry.bats

@@ -145,9 +145,12 @@ teardown() {
   assert_success
   assert_output ""
 
+  # When neither per-app image-repo nor a global image-repo-template are set,
+  # reportComputedImageRepo falls back to common.GetAppImageRepo which returns
+  # the default dokku/<app> image name.
   run /bin/bash -c "dokku --quiet registry:report $TEST_APP --format json | jq -r '.\"registry-computed-image-repo\"'"
   assert_success
-  assert_output_not_exists
+  assert_output "dokku/$TEST_APP"
 
   run /bin/bash -c "dokku registry:set --global image-repo-template 'dokku/{{ APP }}'"
   assert_success