[C2] Update BBB to use new database structure (videoconference tables)

[ywarnier]

[christianbeeznest]

This PR #6153 migrates the BigBlueButton (BBB) plugin in Chamilo 2 to use the new videoconference database structure, replacing all direct SQL access (Database::select, insert, update, delete) with Doctrine-based repositories (ConferenceMeeting, ConferenceActivity, ConferenceRecording).

All data interactions now use Symfony and Doctrine ORM.

Note: This refactor requires thorough testing with a live BigBlueButton server to ensure meeting creation, joining, recording, and deletion are fully functional.

[NicoDucou]

Hi @christianbeeznest

I've put a few comment on things to correct in your PR for it to work. I let you revise my comment and implement the proposed solution or a better one.
I also indicate here that on the listing.php page when clicking on the delete meeting icon it does not work, it is still present in the DB and there is no message on the interface indicating the success or the error.
It works when putting a meeting invisible or visible.
I did not check anything related to recording because I can not activate it.