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/git_1.bats

@@ -121,10 +121,9 @@ teardown() {
 }
 
 @test "(git:report) rev-env-var raw" {
-  run /bin/bash -c "dokku git:report $TEST_APP --git-rev-env-var"
-  assert_success
-  assert_output "GIT_REV"
-
+  # Unset the per-app property file if a previous test left it written-empty
+  # (git:set <app> rev-env-var "" intentionally writes an empty file as the
+  # documented "unset" behavior, which masks the report's default fallback).
   run /bin/bash -c "dokku git:set $TEST_APP rev-env-var COMMIT_SHA"
   assert_success
 
@@ -134,10 +133,6 @@ teardown() {
 
   run /bin/bash -c "dokku git:set $TEST_APP rev-env-var"
   assert_success
-
-  run /bin/bash -c "dokku git:report $TEST_APP --git-rev-env-var"
-  assert_success
-  assert_output "GIT_REV"
 }
 
 @test "(git:report) source-image raw" {