Add new status URL for GH, remove fingerprint logic from GH webhook code

Merged Martin Lowe requested to merge malowe/git-eca-rest-api:malowe/main/113-2 into main

To better target data and remove some outdated tracking methods, the previous fingerprint mechanism has been removed from the GH webhook code. Additionally, a new status URL matching the format git/eca/status/gh/{fullRepoUrl}/{prNumber} has been added to remove the need for a fingerprint.

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