Remove 'sns.py' as it is no longer needed

[ovlords]

Is your feature request related to a problem? Please describe.
No, it's a cleaning up unnecessary code.

Describe the solution you'd like
The file "provisioners/ansible/library/sns.py" is no longer needed as the Pull Request github.com/ansible/ansible/pull/45634
Has been merged and released. See

aem-stack-manager-messenger/provisioners/ansible/library/sns.py

Line 4 in e263137

# THIS FILE SHOULD BE REMOVED WHEN github.com/ansible/ansible/pull/45634 IS MERGED AND RELEASED

Needs an updated version of Ansible that has this change.

Describe alternatives you've considered
None

Additional context
See @mbloch1986 who can provide more context.