Set LogErrorAsStandardAttribute on GitTasks

[lg2de]

In #1470 was asked to activate LogErrorAsStandard for GitTasks to fix the problem, that git sometimes writes information to the error output even it is not an error.
The issue was closed because the request touches tool wrapper. So, here is the PR which should fix the issue.

The git Coding Guidelines states that different messages are send to error output.
We should check the exit code only.

I confirm that the pull-request:

• Follows the contribution guidelines
• Is based on my own work
• Is in compliance with my employer

I did not check item 2 because I only realize the idea of @georg-eckert-zeiss.