Enable "allow-snippet-annotations" in ingress-nginx static values

nginx v1.9.0 onwards, "allow-snippet-annotations" is disabled
by default due to security vulnerability reported here
https://github.com/kubernetes/ingress-nginx/issues/7837,
openstack failed to apply due to this change since it is using "configuration-snippet" under annotations in its openstack ingress definition.we are changing this default behavior to let openstack apply
successfully until this upstream PR
kubernetes/ingress-nginx#9742 is addressed.
once we upversion the nginx with the fix, we disable
"allow-snippet-annotations" and openstack team will have to change
their configuration.

Test Cases:
PASS: Enable "allow-snippet-annotations" in nginx configmap
      and apply the openstack app successfully
PASS: Test stx-openstack with installation and verify openstack is
      applied successfully

Closes-bug: 2042957

Change-Id: Ic6c379803f17998ef7f573fa1fffa566b9e74e39
Signed-off-by: amantri <[email protected]>

Author: amantri

stx-nginx-ingress-controller-helm/stx-nginx-ingress-controller-helm/fluxcd-manifests/ingress-nginx/ingress-nginx-static-overrides.yaml

@@ -16,6 +16,7 @@ controller:
     useHostPort: false
   nodeSelector:
     node-role.kubernetes.io/control-plane: ""
+  allowSnippetAnnotations: true
   config:
     # https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/configmap/
     nginx-status-ipv4-whitelist: 0.0.0.0/0