Description

See original PR here.

This PR was created to show the changes I made in order to fix 1154

Changes

• Introduce a new enum GHFork.
• Refactor the existing code to use the new GHFork enum.
• Add a new unit test to test GitHub code search including results of forks.
• Gracefully deprecate old methods.
• Add WireMock files for the unit test.

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