fix: add url property to Event class for easy event linking

[naaa760]

PR Description

Overview

• adds a url property to the Event class that returns the full event URL, allowing users to link to events without parsing date strings.

Changes

• Added url property to Event class in src/prefect/events/schemas/events.py
• Added test coverage in tests/events/client/test_events_schema.py

Problem Solved

Previously: [View Event](https://app.prefect.cloud/account/{{ event.account }}/workspace/{{ event.workspace }}/events/event/{{ event.occurred }}/{{ event.id }})

Now: [View Event]({{ event.url }})

Closes #19526

[codspeed-hq[bot]]

CodSpeed Performance Report

Merging #19546 will not alter performance

_{Comparing naaa760:feat/abili-eve-par-dat-str (4d64601) with main (8e02ef3)}

Summary

✅ 2 untouched

[github-actions[bot]]

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