Add Fisheye/Crucible service

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Customer requests we add Atlassian FishEye/Crucible project service. When git polling is configured on the FishEye/Crucible side it polls a lot and for this customer results in 10% of total requests. https://confluence.atlassian.com/fisheye/configuring-commit-hooks-315327572.html has documentation on how to integrate.

Next steps

cc/ @rspeicher How much work do you think this would be?

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