Disable check-migrations until cms plugins have been updated

[sveetch]

A lot of cms plugins have not been updated for Django>=4.0 which result in a pending migration for a change on related_name, i've fixed it for the ckeditor plugin but at least there is fobi, snippet and djangocms_picture which have this issue in Bireli requirements.

For now we need to disable check-migrations task from quality task.

And then after we will have to pull request these applications to fix the migration issue or wait a possible fix release.

[sveetch]

Disabled in 0.3.3-pre.1. Keeping the issue opened to follow cms plugins updates

[sveetch]

Finally we will trying something else in 0.3.3-pre.4. We will use a "white list" instead of disabling task.

We explicitly check for migrations from all apps from django-apps directory so this won't try to scan everything from INSTALLED_APPS, only the one from django-apps.

It should be enough and finally seems more accurate than to also scan packages in an internal project quality. However we lose the capacity to see failures from packages that miss their own migrations.