[tests-only] Add s3ng storage driver to the list of supported drivers

[aduffeck]

Description

Add the s3ng storage driver to the list of supported test drivers as a preparation for the upcoming s3ng tests.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Database schema changes (next release will require increase of minor version instead of patch)
• Breaking change (fix or feature that would cause existing functionality to change)
• Technical debt
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added
• Documentation ticket raised:
• Changelog item, see TEMPLATE

[CLAassistant]

All committers have signed the CLA.

[sonarqubecloud]

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