fix: optimize reconciliation for large clusters

[aa1ex]

Description

Optimize Redis Operator for managing large numbers of objects (hundreds/thousands of Redis resources).

Problems solved:

1. High API server load — controllers were polling every 10s even when nothing changed
2. Slow error recovery — default RateLimiter backoff up to 1000s (~16 min) caused objects to get stuck
3. Bug: objects stuck waiting for StatefulSet — Reconciled() was used instead of RequeueAfter() when StatefulSet is not ready
4. No event-driven reconciliation — Redis and RedisReplication controllers relied only on polling, not watching StatefulSet changes

Changes:

• Add Owns(&appsv1.StatefulSet{}) to Redis and RedisReplication controllers for event-driven reconciliation instead of polling
• Add custom RateLimiter with max backoff of 30s instead of default 1000s
• Fix bug where Reconciled() was used instead of RequeueAfter when StatefulSet is not ready, causing objects to get stuck
• Increase periodic reconcile interval from 10s to 5min for healthy state

Expected impact:

Metric	Before	After
Max backoff on errors	~16 min	30 sec
Polling interval (healthy)	10 sec	5 min
API server load (1000 objects)	~100 req/s constant	~3 req/s + events

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist

• All existing tests pass (no new tests added).
• Functionality/bugs have been confirmed to be unchanged or fixed.
• I have performed a self-review of my own code.
• Documentation has been updated or added where necessary.