Add support for context to net-cloudnat, net-firewall-policy modules (#3414)

* net-cloudnat

* net firewall policy

tests/modules/net_cloudnat/context.yaml

@@ -0,0 +1,61 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+values:
+  google_compute_router.router[0]:
+    bgp: []
+    description: null
+    encrypted_interconnect_router: null
+    md5_authentication_keys: []
+    name: test-nat
+    network: projects/foo-dev-net-spoke-0/global/networks/dev-spoke-0
+    project: foo-test-0
+    region: europe-west8
+    timeouts: null
+  google_compute_router_nat.nat:
+    enable_dynamic_port_allocation: false
+    enable_endpoint_independent_mapping: true
+    icmp_idle_timeout_sec: 30
+    initial_nat_ips: null
+    log_config:
+    - enable: false
+      filter: ALL
+    max_ports_per_vm: 65536
+    name: test
+    nat64_subnetwork: []
+    nat_ip_allocate_option: MANUAL_ONLY
+    nat_ips:
+    - 35.10.10.10
+    project: foo-test-0
+    region: europe-west8
+    router: test-nat
+    rules: []
+    source_subnetwork_ip_ranges_to_nat: LIST_OF_SUBNETWORKS
+    source_subnetwork_ip_ranges_to_nat64: null
+    subnetwork:
+    - name: projects/foo-dev-net-spoke-0/regions/europe-west1/subnetworks/gce
+      secondary_ip_range_names: []
+      source_ip_ranges_to_nat:
+      - ALL_IP_RANGES
+    tcp_established_idle_timeout_sec: 1200
+    tcp_time_wait_timeout_sec: 120
+    tcp_transitory_idle_timeout_sec: 30
+    timeouts: null
+    type: PUBLIC
+    udp_idle_timeout_sec: 30
+counts:
+  google_compute_router: 1
+  google_compute_router_nat: 1
+  modules: 0
+  resources: 2