CCM- 11597: Tests for getLetters and Mi Endpoint#224

Namitha-Prabhu merged 5 commits intomainNHSDigital/nhs-notify-supplier-api:mainfrom

feature/CCM-11597-GetLetterTestsNHSDigital/nhs-notify-supplier-api:feature/CCM-11597-GetLetterTestsCopy head branch name to clipboard