Decouple code for mirroring, forking and importing

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Summary

Mirroring, forking and importing are different features but they are re-using some code to function.

Improvements

The flow of code should be clearer given that we won't need to re-use models and methods. It'll be easier to read and understand.

Risks

• The mentioned features may break.
• Increase in DB size as this may involve having separate import_states stable for each feature.

Involved components

• app/models/project.rb
• app/models/project_import_state.rb
• ee/app/models/ee/project.rb
• ee/app/models/ee/project_import_state.rb