PADV-1246: Enable external configuration for all courses

[kuipumu]

Ticket

https://agile-jira.pearson.com/browse/PADV-1246

Description

This PR enables the use of external configurations on all courses, this is achieved by removing the lti_consumer.enable_external_config_filter waffle flag and all the code related to it, this waffle flag was required per course to enable this feature.

Type of Change

• Remove the lti_consumer.enable_external_config_filter waffle flag and all it's related code.
• Update all related unit tests.

Testing

1. Install and configure xblock-lti-consumer
2. Create a course and add a LTI 1.3 consumer XBlock.
3. The XBlock should allow you by default to choose "Reusable Configuration", in the "Configuration Type" field.

Reviewers

• @alexjmpb
• @anfbermudezme

[alexjmpb]

Do you happen to know if there's an error if the waffle flag was already created and then is removed from the code?

[kuipumu]

Do you happen to know if there's an error if the waffle flag was already created and then is removed from the code?

@alexjmpb I tested this and there is no issue, this waffle flag only changed the values provider of the config_type field and the presentation of such field on studio, the config_type field value is not affected by this change