Update requestsSortedById() to sort by collection

Update requestsSortedById() to sort NetworkRequestInfo by their
nested collection of NetworkRequest objects vs a single request.
Before the NetworkRequestInfo with the request with the lowest
requestId would be sorted to the top. Now the NetworkRequestInfo
which contains the request with the lowest requestId will be
sorted to the top.

Bug: 173292541
Bug: 171991028
Test: atest FrameworksNetTests
Change-Id: I51e3c00d59443e37ddbf168c423d13df8d14fa64