Handle levels of ansible-lint warnings

[zigarn]

In ansible-lint it is possible to set a warn-list for lower level warnings.
It is shown as such in parseable output with a (warning) at the end of the line.
In SARIF output it is of level warning (instead of error).
So to be consistent, it is more logic to be parsed as WARNING_LOW, like the warning from SARIF.

This PR detect the presence of the final (warning) and use it to lower the severity to WARNING_LOW.
As a bonus, this (warning) is no more in the warning message.

Testing done

Unit test for ansible-lint parser has been updated accordingly to the new parsing.

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[uhafner]

Thanks for the PR!

[zigarn]

About SARIF comparison, I found that the levels are WARNING_HIGH for "errors", and WARNING_NORMAL for "warnings".
So not totally consistent, but at least distinguishing both levels is now done.

[uhafner]

I see. I think it is fine to go with this new classification.