Add GL_PROJECT_PATH for custom hooks

John Cai requested to merge jc-hotfix-add-gl-project-path into master

Some customers are using the glProjectRepository field in the GITALY_REPO env var that we used to pass into custom hooks. This value was not meant to be used externally. However, since the project path variable is useful for customers we will pass this into the custom hooks via a GL_PROJECT_PATH environment variable.

fixes: #2902 (closed)

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