Post migration clean up

Now that the migration is done, we should be removing all the modules that we don't need. We need to disable/uninstall them on production and remove them from our composer file.

For example, we should be able to disable all the migrated modules now. We also have a bunch of modules in our composer file that we don't need. Let's remove them!

Finally, once everything has been cleanup, we should look if we still need to delete all the migrated tables manually. For marketplace, we utilize the drupal hook_update_0000 to clean up, see https://gitlab.eclipse.org/eclipsefdn/it/websites/drupal/eclipsefdn/-/blob/9.1.x/eclipsefdn_newsroom/eclipsefdn_newsroom.install?ref_type=heads