feat(app_update): esp_ota_mark_app_invalid_rollback() without reboot (IDFGH-14234)

[nebkat]

Description

In our application we perform Bluetooth OTAs through a mobile app, reconnecting after the initial OTA to confirm the update as valid or rollback if other issues were encountered.

Currently the only API available to mark the app as invalid is esp_ota_mark_app_invalid_rollback_and_reboot(), which immediately calls esp_restart() on success. This results in the Bluetooth connection being cut short and prevents other app cleanup from happening that we would otherwise do during a cooperative reboot request.

This PR simply extracts the call to esp_restart() to esp_ota_mark_app_invalid_rollback_and_reboot() itself, and provides an esp_ota_mark_app_invalid_rollback() function that does not restart.

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.

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