fix: remove enum constraint on event_type in EventList

[fedepini]

Closes #67

Summary

• Removed "enum": ["Normal", "Warning"] from event_type in EventList.schema.json — Kubernetes does not enforce this constraint and non-standard types (e.g. Error) were causing validation errors
• Updated color fallback in EventList.tsx: Normal → blue, Warning → orange, any other type → grey (previously anything non-Normal defaulted to orange)
• Added example-eventlist-mixed-types example with all three event types to verify the fix visually
• Regenerated all TypeScript types and CRDs; applied updated CRD and examples to cluster

Test plan

• Open the EventList example page and check the new "Mixed event types" panel
• Verify Normal event renders blue, Warning renders orange, Error renders grey
• Confirm no schema validation errors when applying an EventList CR with event_type: Error

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