Subscribe to topic notify-next

[kvp1703]

Fix: Add subscription to notify-next topic for OTA job pickup

Description

This change re-introduces the subscription to the notify-next topic. In a previous re-structuring, this essential topic subscription was inadvertently removed. This topic is crucial for the device to be notified of and pick up new OTA jobs that are created after the device has already connected to the AWS IoT Core. Without this subscription, new OTA jobs initiated post-connection were not being detected by the device.

Test Steps

1. Flash a device with the updated firmware containing this change.
2. Connect the device to AWS IoT Core.
3. After the device has successfully connected, create a new OTA update job targeting this device via AWS IoT Jobs.
4. Verify that the device receives the job notification and proceeds to download and apply the OTA update.

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

Issue 117
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