git output should be written to logs

[lengau]

What needs to get done

The stdout of git commands should be written to the debug log in case it's necessary, and the stderr should be bubbled up to the user if git fails.

Why it needs to get done

Right now git errors are a black box. For example: #788

[syncronize-issues-to-jira]

Thank you for reporting us your feedback!

The internal ticket has been created: https://warthogs.atlassian.net/browse/CRAFT-3273.

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