Fix broken ec2_vpc_vgw tests (#1579) (#1581)

[PR #1579/cea2ab5c backport][stable-5] Fix broken ec2_vpc_vgw tests

This is a backport of PR #1579 as merged into main (cea2ab5).
SUMMARY
The APIs are no longer consistently returning deleted attachments.  Accept both the attachment being listed but marked 'deleted', and not being listed.
Amazon's APIs used to be very slow to update this, making waiting for it a bad idea.
ISSUE TYPE

Bugfix Pull Request

COMPONENT NAME
ec2_vpc_vgw
ADDITIONAL INFORMATION

Reviewed-by: Mark Chappell <None>

changelogs/fragments/1579-ec2_vpc_vgw-deleted.yml

@@ -0,0 +1,2 @@
+trivial:
+- ec2_vpc_vgw - update integration tests to allow for attachments being removed from the list once deleted (https://github.com/ansible-collections/community.aws/pull/1579).

tests/integration/targets/ec2_vpc_vgw/tasks/main.yml

@@ -105,8 +105,11 @@
           - vgw_details.state == 'available'
           - '"Name" in vgw_details.resource_tags'
           - vgw_details.resource_tags.Name == vgw_name
-          - vgw_details.vpc_attachments | length == 2
-          - attach_1_description in vgw_details.vpc_attachments
+          - (
+              attach_1_description in vgw_details.vpc_attachments
+              and
+              vgw_details.vpc_attachments | length == 2
+            ) or ( vgw_details.vpc_attachments | length == 1 )
           - attach_2_description in vgw_details.vpc_attachments
 
     - name: get VPC VGW facts by Tag
@@ -138,8 +141,11 @@
           - vgw_details.state == 'available'
           - '"Name" in vgw_details.resource_tags'
           - vgw_details.resource_tags.Name == vgw_name
-          - vgw_details.vpc_attachments | length == 2
-          - attach_1_description in vgw_details.vpc_attachments
+          - (
+              attach_1_description in vgw_details.vpc_attachments
+              and
+              vgw_details.vpc_attachments | length == 2
+            ) or ( vgw_details.vpc_attachments | length == 1 )
           - attach_2_description in vgw_details.vpc_attachments
 
     # ============================================================
@@ -211,7 +217,7 @@
     - name: delete vpn gateway
       ec2_vpc_vgw:
         state: absent
-        vpn_gateway_id: '{{ vgw.vgw.id }}'
+        vpn_gateway_id: '{{ vgw.vgw.id | default(vgw_id) }}'
       ignore_errors: yes
 
     - name: delete vpc