Reactor SdsRequestBuilder to avoid code duplication

[MartinWheelerMT]

What

• Remove duplicated methods in SdsRequestBuilder which can easy be called by providing the interactionUrn.
• Updated SdsRequestBuilderTest to reflect these changes and introduce shared TestConstants.
• Refactor SdsClient to use the updated methods from the refactored SdsRequestBuilder.
• Updated SdsClientTests to reflect these changes.

Why

There are a number of places with unnecessary code duplication. This fixes one such instance.

Type of Change

Please check the option(s) that apply.

• Internal change (non-breaking change with no effect on functionality affecting end users)

Checklist

• I have performed a self-review of my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have updated the Changelog with details of my change in the UNRELEASED section, if this change will affect end users

[github-actions]

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