Fix GitHub authored-commit validation logging

[joanagmaia]

https://app.datadoghq.com/logs?query=cluster_name:cm-prod-oracle%20status:error%20@msg:%22You%20need%20to%20use%20github%20authored%20commit%20activity%20for%20finding%20matching%20git%20activity%20attributes%22&agg_m=count&agg_m_source=base&agg_t=count&clustering_pattern_field_path=message&cols=host,service&fromUser=true&messageDisplay=inline&storage=hot&stream_sort=desc&viz=stream&from_ts=1738516063536&to_ts=1738775263536&live=true

There are thousands and thousands of error logs with this msg:
You need to use github authored commit activity for finding matching git activity attributes

Issues:

1. This is being logged for activities where activity type is authored-commit. And this should only be logged for activities that are not authored-commit type.
2. IMO This should not be an error log, but rather a warn or info
3. Code uses activity.platform !== PlatformType.GITHUB ||activity.type !== GithubActivityType.AUTHORED_COMMIT to log the error but activity.platform doesn't exist. Should probably be passed in the parameters

But ultimately, if we are no longer using the github archive, why are we still using this function?