Address minor outstanding follow-ups for Value Streams

What does this MR do and why?

Address minor outstanding follow-ups for Value Streams

• Adds a missing full stop to the aggregation warning - !154219 (comment 1938064080)
• Fixes an incorrect test name - !154522 (comment 1934179616)

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

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How to set up and validate locally

All analytics tests passing

$ yarn jest analytics