Update metrics used in GA4 All Traffic Widget for consistency

## Bug Description

In #6639 we changed the source links in GA4 dashboard widgets to point to the correct locations in the GA4 reporting interfaces on the service. In doing so, a few of the metrics that are used within the All Traffic Widget were changed to use the incorrect users metric `activeUsers` instead of `totalUsers`. This is likely due to an oversight when trying to match the destination URL since GA4 uses `activeUsers` by default on the service.

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## Implementation Brief

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