expose core tekton webhook replicas setting in operator TektonConfig

We set to the default of 1, but exposing the setting allows us to override the
setting in infra-deployments
rh-pre-commit.version: 2.1.0
rh-pre-commit.check-secrets: ENABLED

operator/gitops/argocd/pipeline-service/openshift-pipelines/tekton-config.yaml

@@ -43,6 +43,15 @@ spec:
     enable-git-resolver: true
     enable-hub-resolver: true
     enable-tekton-oci-bundles: true
+    options:
+      disabled: false
+      deployments:
+        tekton-operator-proxy-webhook:
+          spec:
+            replicas: 1
+        tekton-pipelines-webhook:
+          spec:
+            replicas: 1
     performance:
       disable-ha: false
       buckets: 1