Update GA event category for a few widget events

Related to our GA tracking event refinements, in addition to the Idea Hub widget-specific events (see #4005), we should also adjust the existing events for All Traffic and PageSpeed accordingly.

---

Do not alter or remove anything below. The following sections will be managed by moderators only.

Acceptance criteria

• All of the event categories mentioned below should technically rely on the VIEW_CONTEXT_* constants for their first name segment (i.e. don’t hardcode “dashboard” but use the constant instead). It should rely on the current view context, which for both of the widgets here could be either dashboard or pageDashboard.
• The all_traffic_widget GA event category should be renamed to {viewContext}_all-traffic-widget across all usages (including widget tooltip tour).
• The pagespeed_widget GA event category should be renamed to {viewContext}_pagespeed-widget across all usages.

Implementation Brief

• Create a new ViewContextContext.js file in the assets/js/components/Root/ directory. It should create a new context with an empty string as the default value and export the new context object as the default export.
• Update the Root component:
  • Wrap children with the new ViewContext provider imported from the ViewContextContext file.
  • Remove the viewContext property from ErrorHandler and FeatureToursDesktop elements.
• Update the ErrorHandler component:
  • Use the ViewContext context object imported from the ViewContextContext file as ErrorHandlers contextType property. See the Reactjs documentation for more infomration.
  • Update the trackEvent call in the componentDidCatch method to use ${ this.context || 'unkonwn' } instead of ${ viewContext } in the event name.
  • Update the FeatureTours component to receive the veiwContext variable using the useContext hook.
• Update DimensionTabs and UserDimensionsPieChart components from the analytics module to receive the current viewContext using the useContext hook and to use the viewContext value as a prefix for the all_traffic_widget GA event category ({viewContext}_all-traffic-widget).
• Update DashboardPageSpeed and Recommendation components from the pagespeed-insights module to receive the current viewContext using the useContext hook and to use the viewContext value as a prefix for the pagespeed_widget GA event category ({viewContext}_pagespeed-widget).

Test Coverage

• Update existing tests if any fails due to the aforementioned changes.

Visual Regression Changes

• N/A

QA Brief

• Verify that the GA events for the two widgets are as per the AC

Changelog entry

• N/A

[felixarntz]

@johnPhillips Maybe for this issue we could hard-code the feature tours to rely on VIEW_CONTEXT_DASHBOARD as an intermediate solution? Technically this should be sufficient for now, since those feature tours aren’t really shown elsewhere.

[wpdarren]

QA Update: ✅

The all_traffic_widget GA event category is renamed to {viewContext}_all-traffic-widget across all usages. The pagespeed_widget GA event category is renamed to {viewContext}_pagespeed-widget across all usages.