use version 1.20.0

This PR was deployed on the
[arc-playpen-collaborations](https://ucl-cloud.awsapps.com/start/#/) and
moves towards integrating the [updated ansible collection version
1.22.0](https://github.com/UCL-MIRSG/ansible-collection-infra) into this
repo.

Merge into `use-mirsg-infra-collection` branch before merging into
`main`

Changes in this PR:
- Added `./show_resources_to_delete.sh` script to find VPC dependencies
for manual deletion if `terraform destroy` command has been interrupted
when deploying locally
- `configure/playbooks/group_vars/xnat.yml` nginx_upstream_port changed
which addresses [this issue in this repo at
least](UCL-MIRSG/ansible-collection-infra#119)
- `configure/playbooks/roles/setup_xnat_project/tasks/upload_data.yml`
task added to remove python3-requests library before installing
necessary Python dependencies on host
- `configure/playbooks/templates/nginx_reverse_proxy_aws.j2` was added
to fix nginx error caused by aws url being long
- Changed group from `xnat_container_service` to `container_service` in
`provision/templates/ansible_hosts.yml.tftpl` to match playbook names

---------

Co-authored-by: ruaridhg <[email protected]>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Paul Smith <[email protected]>