fix: problems with platform admin users

[joaodiaslobo]

Some pages dependent on the current_organization key from socket assigns for redirects were causing multiple errors when being viewed by platform admin users, this PR changes these pages to use the organization related to the entity being viewed. Also makes sure that buttons to create new entities are only shown if an organization is actually selected.

[reviewpad[bot]]

AI-Generated Summary: This pull request contains various changes primarily aimed at addressing issues with admin users. The changes revolve around clean-up of code and optimizing some features. Highlights include:

• A modification of the way activities are listed by department id in the list_activities_by_department_id function and changes in how permissions are checked in different activity and announcement files.
• Changes to how the activity id and organization is fetched and used in the paths within the activity_live files.
• Modifications to the announcement_live paths.
• Updates to the activity images and the related paths within department_live.

The changes aim to improve user management and application functionality. It must be noted that amidst these changes, deletions slightly outweigh insertions.