Code quality enhancement - Projects Controller

[wrspada02]

Contains too much logic in one place, with some actions not following standard Rails conventions (e.g., reports, ownership, archived).

• index: Builds a data structure with projects and queries activities using hardcoded values like 1.week.ago.
• destroy: Contains logic on when a project can be destroyed (valid_name_confirmation?).
• import: Executes multiple flows and uses hardcoded numbers such as 1.minute and 60.
• import_upload: Sets session values, updates projects, and schedules background tasks.
• change_archived: A protected method with too much logic and varied responsibilities.