Reduce concurrency level on RHEL large s390x (#9622)

RHEL what to test building RPMs with higher need in terms of resources
and want to get build results without noisy neighbor problem, i.e. build
times impacted by competition to get resources on same machine.

Reduce the large flavor to preserve 64 concurrent build capacity of the
default linux/s390x platform.

KFLUXINFRA-2673

Signed-off-by: Hugo Ares <[email protected]>

Author: hugares

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

@@ -126,7 +126,7 @@ spec:
       - name: linux-g64xlarge-amd64
         nominalQuota: '250'
       - name: linux-large-s390x
-        nominalQuota: '12'
+        nominalQuota: '3'
       - name: linux-m2xlarge-amd64
         nominalQuota: '250'
       - name: linux-m2xlarge-arm64

components/multi-platform-controller/production-downstream/kflux-rhel-p01/host-values.yaml

@@ -318,21 +318,21 @@ staticHosts:
    # s390
   s390x-large-static-0:
     address: "10.130.130.12"
-    concurrency: "4"
+    concurrency: "1"
     platform: "linux-large/s390x"
     secret: "ibm-s390x-ssh-key-large-builder"
     user: "root"
 
   s390x-large-static-1:
     address: "10.130.130.26"
-    concurrency: "4"
+    concurrency: "1"
     platform: "linux-large/s390x"
     secret: "ibm-s390x-ssh-key-large-builder"
     user: "root"
 
   s390x-large-static-2:
     address: "10.130.130.42"
-    concurrency: "4"
+    concurrency: "1"
     platform: "linux-large/s390x"
     secret: "ibm-s390x-ssh-key-large-builder"
     user: "root"