Revert "Wind down/clean up Rackspace Flex SJC3 resources"

This reverts commit 515ad45dbf246f2a6efe13440adc21ba0c639c0c.

The follow up change to use the rew tenant is not ready yet; wait
until it is to wind down.

Change-Id: Iab7726c1c71aad0053e51f082d3ba6a7e413e08e

zuul.d/providers.yaml

@@ -20,7 +20,10 @@
       - name: 16GB
         description: 4vcpu, 16GB ram, 80GB disk
         flavor-name: gp.0.4.16
-    images: []
+    images:
+      - debian-bullseye
+      - ubuntu-jammy
+      - ubuntu-noble
 
 - section:
     name: raxflex-sjc3
@@ -31,7 +34,20 @@
 - provider:
     name: raxflex-sjc3-main
     section: raxflex-sjc3
-    labels: []
+    labels:
+      # Bullseye
+      - niz-debian-bullseye-normal
+      - niz-debian-bullseye-4GB
+      - niz-debian-bullseye-8GB
+      - niz-debian-bullseye-16GB
+      # jammy
+      - niz-ubuntu-jammy-4GB
+      - niz-ubuntu-jammy-8GB
+      - niz-ubuntu-jammy-16GB
+      # noble
+      - niz-ubuntu-noble-4GB
+      - niz-ubuntu-noble-8GB
+      - niz-ubuntu-noble-16GB
 
 # Vexxhost
 - section: