Move global.push config to salt.auto_apply

The active-push tunables (enabled, highstate_interval_hours, debounce_seconds,
drain_interval, batch, batch_wait) described how Salt auto-applies changes, not
general grid config, so relocate them from the global namespace to a new
salt.auto_apply settings module.

- Add salt/salt/{defaults.yaml,auto_apply.map.jinja,soc_salt.yaml,adv_salt.yaml}.
  auto_apply.map.jinja is a dedicated, side-effect-free merge map (the existing
  salt/salt/map.jinja dereferences pillar.host.mainint at import time).
- Remove the push blocks from salt/global/{defaults,soc_global}.yaml.
- Register salt.soc_salt/salt.adv_salt in pillar/top.sls; seed the local pillar
  stubs for fresh installs (make_some_dirs) and upgrades (ensure_salt_local_pillar
  in soup, wired into up_to_3.2.0).
- Repoint all consumers: GLOBALMERGED.push.* -> AUTOAPPLY.* (schedule, salt
  master, manager beacons, beacons_pushstate, orch.push_batch) and
  pillar.get('global:push...') -> 'salt:auto_apply...' (push reactors,
  so-push-drainer).
- Add a salt: fleetwide-highstate entry to pillar_push_map.yaml so edits keep
  applying immediately, matching the prior global-namespace behavior.

salt/schedule.sls

@@ -1,22 +1,22 @@
 {% from 'vars/globals.map.jinja' import GLOBALS %}
-{% from 'global/map.jinja' import GLOBALMERGED %}
+{% from 'salt/auto_apply.map.jinja' import AUTOAPPLY %}
 
 highstate_schedule:
   schedule.present:
     - function: state.highstate
-    - hours: {{ GLOBALMERGED.push.highstate_interval_hours }}
+    - hours: {{ AUTOAPPLY.highstate_interval_hours }}
     - maxrunning: 1
 {% if not GLOBALS.is_manager %}
     - splay: 1800
 {% endif %}
 
-{% if GLOBALS.is_manager and GLOBALMERGED.push.enabled %}
+{% if GLOBALS.is_manager and AUTOAPPLY.enabled %}
 push_drain_schedule:
   schedule.present:
     - function: cmd.run
     - job_args:
       - /usr/sbin/so-push-drainer
-    - seconds: {{ GLOBALMERGED.push.drain_interval }}
+    - seconds: {{ AUTOAPPLY.drain_interval }}
     - maxrunning: 1
     - return_job: False
 {% elif GLOBALS.is_manager %}