Inherit top-level nodeSelector in horizon template

[olliewalsh]

Depends-On: openstack-k8s-operators/horizon-operator#388
Jira: OSPRH-10734

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: olliewalsh

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [olliewalsh]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[softwarefactory-project-zuul]

Build failed (check pipeline). Post recheck (without leading slash)
to rerun all jobs. Make sure the failure cause has been resolved before
you rerun jobs.

https://softwarefactory-project.io/zuul/t/rdoproject.org/buildset/52f38c9816f941c9af226f07387cc6e1

Warning:
Dependency cycle detected and project openstack-k8s-operators/horizon-operator doesn't allow circular dependencies

[openshift-ci]

@olliewalsh: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/openstack-operator-build-deploy-kuttl	a0c920a	link	true	/test openstack-operator-build-deploy-kuttl

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.