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

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

awx/main/tests/functional/api/test_instance.py

@@ -84,5 +84,6 @@ def test_custom_hostname_regex(post, admin_user):
                 "hostname": value[0],
                 "node_type": "execution",
                 "node_state": "installed",
+                "peers": [],
             }
             post(url=url, user=admin_user, data=data, expect=value[1])