Prepare Eventhubs for July Release

[LarryOsterman]

No description provided.

[Copilot]

Pull Request Overview

This PR updates the Event Hubs changelog to mark the 0.5.0 release with its release date and removes the interim “Unreleased” placeholder sections.

• Set the 0.5.0 header to the actual release date (2025-07-11).
• Cleaned up empty “Unreleased” subsections.
• Preserved the list of breaking changes under the new version.

Comments suppressed due to low confidence (2)

sdk/eventhubs/azure_messaging_eventhubs/CHANGELOG.md:3

• [nitpick] Consider adding an ‘## Unreleased’ section immediately after this release entry to serve as a placeholder for upcoming changes and keep the changelog workflow consistent.

## 0.5.0 (2025-07-11)

sdk/eventhubs/azure_messaging_eventhubs/CHANGELOG.md:8

• [nitpick] For consistency in your bullet list punctuation, consider adding a period at the end of this line, matching the style of the previous item.

- Converted all `time::Duration` types to `azure_core::time::Duration`