[C2] Restore dropbox tool

[ywarnier]

[christianbeeznest]

It is implemented a version with this PR #6795

Thanks for confirmation.

[ywarnier]

• I'm not able to make the dropbox icon show on the course homepage (this is probably to add in a migration or later to do by onedleve
• There is a setting in 'Course' section that says "Active tools on course creation". It has "dropbox" unmarked, but now that dropbox is back, the setting should be changed by default (I'm not sure why it was unmarked by default). Currently, marking it does not do anything (normally, when unmarked, the tool should still appear but it should be hidden by default (the eye should be closed)).

So I couldn't test it for now.

[christianbeeznest]

It is added the file of migration in this commit 499e558

Run these commands:

php bin/console doctrine:migrations:execute Chamilo\CoreBundle\Migrations\Schema\V200\Version20250918170500
php bin/console doctrine:migrations:execute Chamilo\CoreBundle\Migrations\Schema\V200\Version20250923205900