Making API more obvious

Why

Right now we have an api that has repository_id and repository_name. Since the repository in question is a project we should probably use that. Additionally repository_name => project_name wouldn't really make sense since it isn't the project's name it is the project's full path. Since project_full_path seemed a little long and didn't look as cool next to project_id I decided to opt for project_path.

Some of this work came out of a recommendation from @viktomas. See the goals section for more details.

🎯 Goals

• Make the API more consistent with GitLab Terminology
• Maintain the internal consistency of the API
• Satisfy this request !46 (comment 1358922876)
• Satisfy this request gitlab-org/gitlab-vscode-extension!754 (comment 1356584316)

👥 Reviewers

Please review for correctness and for alignment with the goals described above.