CCM-12995: Adding sns topic policy for sub #1391

Job	Run time
Set CI/CD metadata	6s
Commit stage / Detect Terraform Changes	6s
Commit stage / Scan secrets	6s
Commit stage / Check file format	6s
Commit stage / Check TODO usage	5s
Commit stage / Check Markdown format	8s
Commit stage / Count lines of code	6s
Commit stage / Check for changes to event schema package compared to main branch	7s
Commit stage / Check English usage	8s
Commit stage / Scan dependencies	24s
Commit stage / Run terraform-docs	5s
Commit stage / Trivy Scan	4m 42s
Commit stage / Lint Terraform	4s
Commit stage / Check event schema version has been updated	0s
Commit stage / Check event schemas have been regenerated	0s
Test stage	-1s
Acceptance stage	0s
Build stage	-1s
Publish stage	0s
	6m 11s

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