Rework the gitconfig configmap provision (#766)

[vinokurig]

Enhance the provision of the workspace gitconfig, to be able to respect data another from username and email.

What does this PR do?

cherry-pick from #766

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What issues does this PR fix or reference?

How to test this PR?

PR Checklist

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• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

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