Remove legacy references and clean up for NHSDigital migration #22

Job	Run time
Set CI/CD metadata	8s
Commit stage / Check file format	11s
Commit stage / Scan secrets	2m 16s
Commit stage / Check Markdown format	11s
Commit stage / Scan dependencies	45s
Commit stage / Lint Terraform	8s
Commit stage / Count lines of code	8s
Commit stage / Check English usage	10s
Test stage	-1s
Acceptance stage	0s
Build stage	0s
	3m 56s

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