Bug Description

We recently changed how notifications are checked for being active on the dashboard in GA as part of #11663.
In doing so, some resolvers were changed which has introduced a regression where it's possible for the enhanced measurement settings to be requested twice.

Steps to reproduce

1. Set up GA
2. Visit dashboard
3. See duplicate request for enhanced-measurement-settings

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Acceptance criteria

• Enhanced measurement settings should only be requested once over the network per page load

Implementation Brief

• Update all enhanced measurement selectors with resolvers (other than getEnhancedMeasurementSettings) to resolveSelect -> getEnhancedMeasurementSettings rather than copying/duplicating the same resolver
  • i.e. isEnhancedMeasurementStreamEnabled and isEnhancedMeasurementStreamAlreadyEnabled
• See Fix duplicate requests for enhanced measurement settings #11767

Test Coverage

• No changes. While this is possible to reproduce in a test, it's a bit cumbersome to do as it requires returning the response async, otherwise the response is essentially received instantly and doesn't reproduce the issue. This should ideally be addressed at a higher level though rather than at the individual selector level and so new issues will be opened to address this holistically.

QA Brief

• See steps to reproduce. Only a single request for EM settings should be made on the dashboard where previously it was triggering twice.

Changelog entry

• Prevent an unnecessary request to the enhanced-measurement-settings endpoint when loading the dashboard.