feat(AutoLabeler): don't give up if getting changes failed

Merged Leo requested to merge Leo/aports-qa-bot:dont-return-early into master

there are other operations that are also done like adding v for backports to stable branches and in the future adding tag:security label.

As such we should not return early if we fail to get changes, but still we should log an ERROR instead of an WARN because failing here causes a non-total but significant lost of expected functionality.

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