return an error code when an mqtt5 puback has a failing reason code

[sbSteveK]

• mqtt3 should have a non-successful error_code when a failed reason code puback is received using the mqtt5 to mqtt3 adapter.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 82.57%. Comparing base (d4346e0) to head (a417561).

Files	Patch %	Lines
source/v5/mqtt5_to_mqtt3_adapter.c	80.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #352 +/- ## ========================================== + Coverage 82.55% 82.57% +0.01% ========================================== Files 20 20 Lines 8764 8767 +3 ========================================== + Hits 7235 7239 +4 + Misses 1529 1528 -1 ```

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