fix: apply library_content transformer to all ItemBankMixin xblocks

[MaferMazu]

Description

This PR adds logic to the library_content transformer to support all xblocks that inherit from ItemBankMixin.

Supporting information

Problem

The transformer didn't remove the non-selected children from the problem bank (randomized content from a content library v2 - itembankblock in the code), so the structure shows inconsistent information (more questions/grades than the user is available to see/solve)

Solution

Adding the logic to analyze the block_class and check whether it inherits from itembankmixin. I apply the same logic as the legacy library content to all xblocks with randomized content, without removing support for the legacy libraries.

Testing instructions

Pre-requisites:

• Have a tutor environment with a master or a release greater than or equal to teak (cherry-pick the commit from this branch or use this branch if you are using master)
• Have a course, and in Settings > Scheduled & Details, verify the course start date (use an old date, for example, 2020)
• Configure grading Settings > Grading.

Test:

LegacyLibraries

1. Create a Legacy Library (in Studio, click Legacy Libraries, and then +New Library) and add some problems for testing.
2. In a course, add a subsection, and then a unit, and then a "Legacy Library" component. (configure grade to the subsection)
3. Edit the "Legacy Library" component to use the library created, and if you want, you can configure how many problems are going to show to the student.
4. Publish the content.
5. Click view live version.

Things to verify in LMS (with the live version or a student account):

• In the outline, the section shows the correct number of questions.
• In the progress page, in the detailed grades, you should only see the gradable XBlocks available.

ProblemBank

1. Create a Content Library (in Studio, click +New Library) and add some problems for testing.
2. In a course, add a subsection, and then a unit, and then a "Problem Bank" component. (configure grade to the subsection)
3. Add components to the "Problem Bank", and if you want, you can configure how many problems are going to show to the student.
4. Publish the content.
5. Click view live version.

Things to verify in LMS (with the live version or a student account):
The same from the LegacyLibraries

Another Xblock (optional)

1. Install an Xblock that inherits from ItemBankMixin (for example, https://github.com/eduNEXT-collab/xblock-exam-question-bank)
2. Activate the plugin in the course https://github.com/eduNEXT-collab/xblock-exam-question-bank?tab=readme-ov-file#enabling-the-xblock-in-a-course
3. In a course, add a subsection, and then a unit, and then an "Advanced" component, and select the custom XBlock. (configure grade to the subsection)
4. Publish the content.
5. Click view live version.

Things to verify in LMS (with the live version or a student account):
The same from the LegacyLibraries

Screenshots

Base

Problem Bank Configuration (to show 1 of 4 problems)

Before

Problem Bank in LMS (problem: in the sidebar bar, it shows we had four problems available when we have 1)

After

Problem Bank in LMS (It shows we have 1 question) ✅

Progress in LMS (In the grade details, we have the correct information) ✅

[openedx-webhooks]

Thanks for the pull request, @MaferMazu!

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