Remove WorkflowJobSourceAdapter reference

[KirkMunro]

PR Summary

This PR removes a reference to WorkflowJobSourceAdapter that is no longer used, as part of the workflow cleanup.

PR Context

See issue #9570.

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[iSazonov]

@PaulHigin Please update your code review.

[KirkMunro]

@SteveL-MSFT This PR is waiting for your review. All it does is remove an if clause related to workflow, replacing the entire if/else statement with the body of the else clause. No other code has changed, should be quick and easy.

[iSazonov]

@SteveL-MSFT Have you any thoughts about the PR?

[ghost]

🎉v7.0.0-preview.5 has been released which incorporates this pull request.:tada:

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