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.

libraries/push/test/build.gradle.kts

@@ -21,6 +21,7 @@ dependencies {
     implementation(projects.libraries.push.impl)
     implementation(projects.libraries.matrix.api)
     implementation(projects.libraries.matrixui)
+    implementation(projects.libraries.workmanager.api)
     implementation(projects.tests.testutils)
     implementation(libs.androidx.core)
     implementation(libs.coil.compose)

libraries/push/test/src/main/kotlin/io/element/android/libraries/push/test/workmanager/FakeSyncPendingNotificationsRequestBuilder.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.push.test.workmanager
+
+import io.element.android.libraries.push.impl.workmanager.SyncPendingNotificationsRequestBuilder
+import io.element.android.libraries.workmanager.api.WorkManagerRequestWrapper
+
+class FakeSyncPendingNotificationsRequestBuilder(
+    private val build: () -> Result<List<WorkManagerRequestWrapper>> = { Result.success(emptyList()) },
+) : SyncPendingNotificationsRequestBuilder {
+    override suspend fun build(): Result<List<WorkManagerRequestWrapper>> = build.invoke()
+}