Retire networking-midonet

It was deprecated during Wallaby cycle. since Victoria and older stable
branches all reachd their EOL, there is no active branch kept.

Change-Id: I80a38b835b2fdd84d1179c5029e318b3aa58b4f8
Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>

reference/legacy.yaml

@@ -653,6 +653,10 @@ neutron:
       retired-on: 2024-05-15
       repos:
         - openstack/networking-ovn
+    networking-midonet:
+      retired-on: 2025-07-18
+      repos:
+        - openstack/networking-midonet
 
 octavia:
   irc-channel: openstack-lbaas

reference/projects.yaml

@@ -880,11 +880,6 @@ neutron:
     networking-bgpvpn:
       repos:
         - openstack/networking-bgpvpn
-    networking-midonet:
-      deprecated: wallaby
-      release-management: deprecated
-      repos:
-        - openstack/networking-midonet
     networking-odl:
       deprecated: '2023.2'
       release-management: deprecated