Update environments nav controls icons
What does this MR do?
Updates environments nav controls, so that they use svg icons.
Screenshots (if relevant)
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Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary -
Tests added for this feature/bug - Conform by the code review guidelines
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Has been reviewed by a UX Designer -
Has been reviewed by a Frontend maintainer
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What are the relevant issue numbers?
Following changes in !18632 (merged) for #38755 (closed).
Edited by Hazel Yang