Add network constraints for fetching notifications with WorkManager (#6305)

* Add `isNetworkBlocked` and `isInAirGappedEnvironment` to `NetworkMonitor`.

* Improve the DI of `SyncPendingNotificationsRequestBuilder` to simplify its usage.

* Only update `isInAirGappedEnvironment` in `DefaultNetworkManager` if the current build is an enterprise one.

* Add network constraints to `DefaultSyncPendingNotificationsRequestBuilder` based on the air-gapped status.

* Add a feature flag to disable the new check, in case it doesn't work as expected.

features/networkmonitor/test/src/main/kotlin/io/element/android/features/networkmonitor/test/FakeNetworkMonitor.kt

@@ -14,8 +14,16 @@ import kotlinx.coroutines.flow.MutableStateFlow
 
 class FakeNetworkMonitor(
     initialStatus: NetworkStatus = NetworkStatus.Connected,
-    private val isNetworkBlockedLambda: () -> Boolean = { false },
 ) : NetworkMonitor {
     override val connectivity = MutableStateFlow(initialStatus)
-    override fun isNetworkBlocked(): Boolean = isNetworkBlockedLambda()
+    override val isNetworkBlocked = MutableStateFlow(false)
+    override val isInAirGappedEnvironment = MutableStateFlow(false)
+
+    fun givenNetworkBlocked(isBlocked: Boolean) {
+        isNetworkBlocked.value = isBlocked
+    }
+
+    fun givenIsInAirGappedEnvironment(isInAirGapped: Boolean) {
+        isInAirGappedEnvironment.value = isInAirGapped
+    }
 }