Add peers readonly api and instancelink constraint (#13916)

Add Disconnected link state

introspect_receptor_connections is a periodic
task that examines active receptor connections
and cross-checks it with the InstanceLink info.

Any links that should be active but are not
will be put into a Disconnected state. If
active, it will be in an Established state.

UI - Add hop creation and peers mgmt (#13922)

* add UI for mgmt peers, instance edit and add

* add peer info on detail and bug fix on detail

* remove unused chip and change peer label

* rename lookup, put Instance type disable on edit

---------

Co-authored-by: tanganellilore <lorenzo.tanagnelli@hotmail.it>

awx/main/access.py

@@ -39,6 +39,7 @@ from awx.main.models import (
     Host,
     Instance,
     InstanceGroup,
+    InstanceLink,
     Inventory,
     InventorySource,
     InventoryUpdate,
@@ -2949,6 +2950,22 @@ class WorkflowApprovalTemplateAccess(BaseAccess):
         return self.model.objects.filter(workflowjobtemplatenodes__workflow_job_template__in=WorkflowJobTemplate.accessible_pk_qs(self.user, 'read_role'))
 
 
+class PeersAccess(BaseAccess):
+    model = InstanceLink
+
+    def can_add(self, data):
+        return False
+
+    def can_change(self, obj, data):
+        return False
+
+    def can_delete(self, obj):
+        return True
+
+    def can_copy(self, obj):
+        return False
+
+
 for cls in BaseAccess.__subclasses__():
     access_registry[cls.model] = cls
 access_registry[UnpartitionedJobEvent] = UnpartitionedJobEventAccess