AutoOps redesigned experience

**What the feature is and who it's for**
A redesigned AutoOps experience for Elastic Cloud Hosted and Self-Managed (Cloud Connected) clusters. It introduces a new Critical severity tier with reclassified event severities, a rebuilt Template Optimizer, and improvements across the deployment, multi-cluster, and Nodes and Shards views.

**Value proposition**
A faster, clearer path from insight to action. Sharper severity classification drives better prioritization and notification routing, so teams cut through the noise, focus on what matters most, and act in fewer clicks.

**Expected outcome**

- New Critical severity tier with reclassified event severities - for sharper prioritization and notification routing
- Rebuilt Template Optimizer with easier navigation and search, flagging only the templates that have issues
- Improvements to the deployment, multi-cluster, and Nodes and Shards views