Added `WorkflowsClientTests` to validate the behavior of the
`WorkflowsClient` class, covering PDF validation and Swiss QR
code extraction. Introduced test doubles for `IPdfValidationClient`
and `ISwissQrCodeClient` using `Moq`.
Implemented tests for all overloads of `ExtractSwissQrCodeValidatedAsync`:
- Byte array, stream, and file path inputs.
- Valid, invalid, and empty PDFs.
- Raw mode and cancellation token handling.
- Exception propagation and orchestration contracts.
Ensured comprehensive test coverage for all branches and edge cases.
TekH
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