[bug] ClearlyDefinedTests are flaky

[lumjjb]

Describe the bug
Clearly defined tests are flaky

To Reproduce

See failing CIs: https://github.com/guacsec/guac/actions/runs/11797715031/job/32862288131

Expected behavior

Tests should not flake

Screenshots
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GUAC version
NA

Additional context
Add any other context about the problem here.

[pxp928]

TestPurlsLicenseScan is also being skipped as CD fails to respond in time.

[pxp928]

To resolve this, we need to mock out the Clearly Defined service and run the unit tests against that.