Redirect some deprecated repository routes

What does this MR do?

Few things:

1. Move most of routes from repository.rb to repository_scoped.rb
2. Add redirect for deprecated routes. Ex /commits/master to /-/commits/master.
3. Keep serving routes raw, blame, blob and tree in both scopes. Ex both /blob and /-/blob

For #118849 (closed)

Next step will be rename repository.rb to repository_deprecated.rb.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content