VMware: Add check mode support in vmware_vswitch_facts (#47263)

* Check mode support
* Fixed num_ports

test/integration/targets/vmware_vswitch_facts/tasks/main.yml

@@ -59,3 +59,19 @@
 - assert:
     that:
       - switch_facts.hosts_vswitch_facts is defined
+
+- name: Gather vswitch facts about all hosts in given cluster in check mode
+  vmware_vswitch_facts:
+    hostname: "{{ vcsim }}"
+    username: "{{ user }}"
+    password: "{{ passwd }}"
+    esxi_hostname: "{{ host1 }}"
+    validate_certs: no
+  register: switch_facts_check_mode
+  check_mode: yes
+
+- debug: var=switch_facts_check_mode
+
+- assert:
+    that:
+      - switch_facts_check_mode.hosts_vswitch_facts is defined