Goal: Show severity on each event log row so users can see severity before filtering.

Acceptance criteria:

• The Event Log table has a Severity column.

• Column shows the value (CRITICAL, IMPORTANT, MODERATE, LOW, NONE, UNDEFINED).

• Severity is shown with a consistent visual (label) and matches the design system used elsewhere https://www.patternfly.org/patterns/status-and-severity/#severity-icons
  https://www.patternfly.org/components/label#filled-labels

• When the API omits severity, the cell shows a defined fallback (e.g. “—” + “Undefined”) and does not break the table.

• Column is sortable
• Add storybook component test

Notes: Uses existing GET events response; no new API.

https://www.figma.com/design/tkdxV2TMYPlCMgHdfIAaQx/Severity-indicators-in-HCC-UI?node-id=2-37755&t=oEQKhVR5sZMKcEOx-0

https://developers.redhat.com/api-catalog/api/notifications#