Closes: #9047 - Add Provider Accounts (#12057)

* #9047 - ProviderAccount

* #9047 - Move to new selector types

* #9047 - Re-introduce provider FK to Circuit model

* #9047 - Fix broken tests

* Misc cleanup

* Revert errant change

* Fix tests

* Update circuit filter form

---------

Co-authored-by: jeremystretch <jstretch@netboxlabs.com>

netbox/circuits/search.py

@@ -39,12 +39,20 @@ class ProviderIndex(SearchIndex):
     model = models.Provider
     fields = (
         ('name', 100),
-        ('account', 200),
         ('description', 500),
         ('comments', 5000),
     )
 
 
+class ProviderAccountIndex(SearchIndex):
+    model = models.ProviderAccount
+    fields = (
+        ('name', 100),
+        ('account', 200),
+        ('comments', 5000),
+    )
+
+
 @register_search
 class ProviderNetworkIndex(SearchIndex):
     model = models.ProviderNetwork