feat(Git Project): Introducing Git Projects

[gatzjames]

Highlights:

• Added new project type: Git
• Git projects allow syncing the entire project using a single repository
• Git projects have a single sync dropdown for commit/sync actions accessible from all project files

Todo/Next steps:

• Consolidate Git action logic into a Git service.
• Ensure all file types (Collection/Spec/Environment/MockServer) sync correctly
• Use a YAML diff viewer to match the exported data (currently we use a JSON diff view)
• Add UX for cloning a Git project into an organization
• Expand e2e tests

Closes INS-4248