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/logs.bats

@@ -486,6 +486,9 @@ teardown() {
 }
 
 @test "(logs:report) vector-sink raw vs global" {
+  run create_app
+  assert_success
+
   run /bin/bash -c "dokku logs:set --global vector-sink"
   assert_success
 
@@ -519,6 +522,9 @@ teardown() {
 }
 
 @test "(logs:report) vector-global-image and vector-global-networks raw" {
+  run create_app
+  assert_success
+
   run /bin/bash -c "dokku logs:set --global vector-image"
   assert_success