[BUG] PageViewPerformanceManager.populatePageViewPerformanceEvent() is always returning zero for the network time

[MSNev]

In the populatePageViewPerformanceEvent method of PageViewPerformanceManager there are a couple of issues that need addressing.

1. For Browsers that support the Navigation Timing perf event the calculation of the "networkConnect" time via
   var network = DateTimeUtils.GetDuration(navigationTiming.startTime, navigationTiming.connectEnd);
   is always zero as the GetDuration() only returns a value if BOTH start and end are not zero, null or undefined, however, the startTime (according to https://developer.mozilla.org/en-US/docs/Web/API/PerformanceNavigationTiming) is now always zero
2. The scoping of the variables total, network, request, response, dom are incorrect, while the code seems to be working (with the current version) we should fix the scoping of these variables so they are not "defined" in the if / else clause to avoid a future break by a version of TypeScript, Uglify or browser JS implementation.

[MSNev]

Reopening for release tracking

[MSNev]

v2.6.2 is now fully deployed

[github-actions]

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