Use e2-micro instead of f1-micro as default

tests/modules/net_lb_ext/examples/dual_stack.yaml

@@ -37,7 +37,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     name: my-ig-b
@@ -111,7 +111,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     name: my-ig-c

tests/modules/net_lb_ext/examples/e2e.yaml

@@ -37,7 +37,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata:
       user-data: "#cloud-config\n\n# Copyright 2023 Google LLC\n#\n# Licensed under\
         \ the Apache License, Version 2.0 (the \"License\");\n# you may not use this\
@@ -137,7 +137,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata:
       user-data: "#cloud-config\n\n# Copyright 2023 Google LLC\n#\n# Licensed under\
         \ the Apache License, Version 2.0 (the \"License\");\n# you may not use this\

tests/modules/net_lb_ext/examples/ext_migs.yaml

@@ -37,7 +37,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     name: my-ig-b
@@ -111,7 +111,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     name: my-ig-c

tests/modules/net_lb_ext/examples/fwd_rules.yaml

@@ -37,7 +37,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     name: my-ig-b
@@ -111,7 +111,7 @@ values:
     enable_display: false
     hostname: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     name: my-ig-c

tests/modules/net_lb_ext/examples/migs.yaml

@@ -38,7 +38,7 @@ values:
     guest_accelerator: []
     instance_description: null
     labels: null
-    machine_type: f1-micro
+    machine_type: e2-micro
     metadata: null
     metadata_startup_script: null
     min_cpu_platform: null