Navigation refactoring

[MartinKoleff]

Refactor navigation to:

• [x] Have a manager (NavigationController).
• [x] Wire NavigationController with shared flow.
• [x] isNavigationInProgress to change.
• [x] NavigationEvent wire with NavigationController.
• [x] Wire view models with navigation controller.
• [x] Delete old navigation.
• [ ] Write tests.
• [ ] Rename open...screen functions in view models, rename navigation callbacks in scaffolds.
• [x] Add custon navigation function for clear backstack to destination not the whole backstack.
• [x] Fix exercise not added initially to workout from SearchWorkoutScreen.
• [x] Refactor Destinations createPath with constants path configurator.
• [x] Fix WorkoutsScreen segment buttons always navigating to WorkoutsScreen on option selected.
• [x] Fix onBack navigation callback for ExerciseDetailsConfiguratorScreen.
• [x] Fix loading wheel in ExerciseDetailsConfiguratorScreen instantly hidden.
• [x] Fix hasUpdated flag not raised for deleting exercise from WorkoutDetailsScreen.
• [x] Fix hasUpdated flag not raised for adding/updating exercise from ExerciseDetailsConfiguratorScreen.
• [x] [Bug] NavigateBack event can go to empty screen (add constraints to NavBackstackEntry.size == 2)
• [x] Navigate to same screen constraint.

[MartinKoleff]

During my investigation of fixing a bug about popUpTo l realized that popUpTo Workouts screen from SearchWorkoutsScreen has never worked. You have to popUpTo Dashboard.