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.

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue