Problem/Motivation
When a media+file is deleted, and cannot be deleted due to access control reasons, an irrelevant message is shown.
> The file attached to this media is owned by %name so will be retained.
For example, if delete any file denies deletion, the message show is completely irrelevant.
The owner may also be missing, which leads to a calling-method-on-null error.
We should fix this, by adding a more generic access control error, optionally showing the relevant error, and logging the error + reason to logs.
Proposed resolution
Add option to show reason. New sites show it, existing sites do not.
Add a thin + generic configuration service.
Always log the failure and reason to logs.
Modernise forms dependency injection w new autowire trait.
Increase minimum core version (10.2 and later)
Add missing entity usage dependency for tests. See also
📌
Add gitlabci
Fixed
Remaining tasks
Review, tests.
User interface changes
New options in config form.
New strings shown to user depending on module configuration
API changes
Services changed, New services, new configuration
Data model changes
New configuration.
