Reduce concurrent PLRs in the Openstack cluster (#9394)

In the Openstack cluster build are usually triggered in groups of 100+.
This overloads external system and the result is rate limiting /
network issues that fail the pipelines.

For more context - https://issues.redhat.com/browse/KONFLUX-10958?focusedId=28570810&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpanel#comment-28570810

Signed-off-by: Gal Ben Haim <[email protected]>

Author: gbenhaim

components/kueue/production/kflux-osp-p01/queue-config/cluster-queue.yaml

@@ -24,15 +24,15 @@ spec:
     - name: default-flavor
       resources:
       - name: tekton.dev/pipelineruns
-        nominalQuota: '300'
+        nominalQuota: '30'
       - name: cpu
         nominalQuota: 1k
       - name: memory
         nominalQuota: 500Ti
       - name: aws-ip
         nominalQuota: '250'
       - name: mintmaker
-        nominalQuota: '150'
+        nominalQuota: '5'
   - coveredResources:
     - linux-amd64
     - linux-arm64