Fix canary legend for single series
What does this MR do?
Fixes the legends labels for single series so as not to show a series 1 label everytime
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 - Review
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Has been reviewed by UX -
Has been reviewed by Frontend
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Conform by the merge request performance guides -
Conform by the style guides -
Squashed related commits together
What are the relevant issue numbers?
Edited by Taurie Davis