Azure storage service tests

[Jonopono123]

What

Test coverage for AzureStorageService class

Why

Since its creation the AzureStorageService class has not had any test coverage, and it's in our best interest to add this.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Internal change (non-breaking change with no effect on the functionality affecting end users)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• I have performed a self-review of my code
• My changes generate no new warnings
• New and existing unit tests pass locally with my changes

[github-actions]

Images built and published to ECR using a Build Id of PR-1025-d143234

[github-actions]

Looks good. All 1 mutations in this change were killed.

class	surviving	killed
💯uk.nhs.adaptors.pss.translator.storage.AzureStorageService	0	1

See https://pitest.org

• Arcmutate licence valid until 2028-03-02 (yyyy/mm/dd) (non-commercial use only)
• Project uses Spring, but the Arcmutate Spring plugin is not present.

[MartinWheelerMT]

This has been addressed in a separate PR