EE-Port "Better SVG Usage in the Frontend"

Tim Zallmann requested to merge ee-36231-better-svg-usage-in-the-frontend into master

What does this MR do?

It is the EE Port of gitlab-org/gitlab-ce!13435 , including setting of EE specific Sprite Icons in the Navigation.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Edited by Tim Zallmann

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