Release 2.45.0

Summary

• introduce explicit entry activities and time-limited content (basic version for now)
• fix left menu bug when skills were disabled
• fix bug with the content children edition switch
• fix bug with the error message on the edit page

All

• fix wrong left menu visibily condition when skills not displayed #1766
• Bugfix/empty content on the parameters page #1765
• Fixes switch edit mode #1764
• Handle explicit-entry activities #1758
• Item-content cleanup #1757
• Adds e2e tests for item content #1761