[QSDetailedView] Add the `InternetDetailsContentManager`

Extract the view logic out from the `InternetDialogDelegate` into the
`InternetDetailsContentManager`. This class will later be used by
the non dialog details view.

Also renamed `InternetDetailedViewModel` ->  `InternetDetailsViewModel`
to make the file name consistent with the class name.

Bug:b/377388104
Flag: com.android.systemui.qs_tile_detailed_view
Test: InternetDetailsContentManagerTest
Change-Id: I1e4183f7e30f11ecb35c2d48882c58294010f939