add cifmw_snr_nhc role for SNR and NHC deployment

This role automates the deployment and verification of the
Self Node Remediation (SNR) and Node Health Check (NHC)
components on OpenShift clusters.

Included features:
- Creation of required namespaces and OperatorGroups
- Installation of SNR and NHC operators via Subscriptions
- Verification of CRs like SelfNodeRemediationTemplate, Config, and NodeHealthCheck
- Full lifecycle handling including status checks and readiness validation

Author: antonioromito

roles/cifmw_snr_nhc/README.md

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+# cifmw_snr_nhc
+Apply Self Node Remediation and Node Health Check Custom Resources on OpenShift.
+
+## Privilege escalation
+None - all actions use the provided kubeconfig and require no additional host privileges.
+
+## Parameters
+* `cifmw_snr_nhc_kubeconfig`: (String) Path to the kubeconfig file.
+* `cifmw_snr_nhc_kubeadmin_password_file`: (String) Path to the kubeadmin password file.
+* `cifmw_snr_nhc_namespace`: (String) Namespace used for SNR and NHC resources.
+
+## Examples
+```yaml
+- name: Configure SNR and NHC
+  hosts: masters
+  roles:
+    - role: cifmw_snr_nhc
+      cifmw_snr_nhc_kubeconfig: "/home/zuul/.kube/config"
+      cifmw_snr_nhc_kubeadmin_password_file: "/home/zuul/.kube/kubeadmin-password"
+      cifmw_snr_nhc_namespace: openshift-workload-availability

roles/cifmw_snr_nhc/defaults/main.yml

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+---
+cifmw_snr_nhc_kubeconfig: "/home/zuul/.kube/config"
+cifmw_snr_nhc_kubeadmin_password_file: "/home/zuul/.kube/kubeadmin-password"
+cifmw_snr_nhc_namespace: openshift-workload-availability

roles/cifmw_snr_nhc/meta/main.yml

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+---
+galaxy_info:
+  author: CI Framework
+  description: CI Framework Role -- cifmw_snr_nhc
+  company: Red Hat
+  license: Apache-2.0
+  min_ansible_version: "2.14"
+  namespace: cifmw
+  galaxy_tags:
+    - cifmw
+
+dependencies: []