Add skip-reconcile annotation support for controlled operator pause

[Kaushik-Vijayakumar]

Fixes Issue #704.

Changes proposed on the PR:

Add support for a skip-reconcile annotation that allows operators to temporarily pause reconciliation for specific Redis Failover resources. This gives operators more control during maintenance windows and migrations.

Example usage:

apiVersion: databases.spotahome.com/v1
kind: RedisFailover
metadata:
  name: redisfailover-sample
  annotations:
    skip-reconcile: "true"
spec:
  # ... rest of the spec

Implementation Details

The implementation checks for the annotation at the start of the reconciliation loop:

if rf.Annotations != nil {
    skipReconcile, ok := rf.Annotations["skip-reconcile"]
    if ok && skipReconcile == "true" {
        r.logger.Infoln("skip-reconcile set to true. Skipping reconcile for", rf.Name)
        return nil
    }
}