Handle the special case for “new visitors” and “returning visitors” to retrieve their metrics for the Selection Panel

[techanvil]

Feature Description

Implement the special case for “new visitors” and “returning visitors” on the Selection Panel whereby their metrics are retrieved using the newVsReturning dimension instead of via the audience until the corresponding audiences are out of the "partial data" state.

See special case to avoid "partial data" state in the design doc.

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Acceptance criteria

• If the connected Analytics property is determined to be in the "partial data" state (see #8141):
  • The Selection Panel user counts for “new visitors” and “returning visitors” should be retrieved via a report that uses the newVsReturning dimension rather than audienceResourceName.
  • As a result, these user counts should reflect the full data available for the property rather than the limited data available for the corresponding audiences.

Implementation Brief

Note: This issue may have some implementation shared with the related issue #8144.

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Test Coverage

QA Brief

Changelog entry