Move editor_saved to VideoConfigService

[farhan]

Ticket: openedx/public-engineering#471

Move editor_saved to VideoConfigService

This moves edx-platform-specific logic out of the VideoBlock, in preparation for the VideoBlock extraction:
#36282

Legacy Video Editor changes in this PR:

Removed:

• studio_view() method

Not removed:

1. editor_saved
2. get_context() method
3. EditingMixin usage

Why these methods still retained?
Removing these method breaks:

1. Transcript uploads on the Video Block in the Content Library (Beta/V2).
2. Fetching uploaded transcripts on authoring mfe video editor window.

To avoid this regression, they have been kept for now.

Below are the details of the testing.

Here are my testing notes:

Testing on LMS/Studio:

A. Uploading transcript

1. Go to any course, add a video (youtube video) into the course
2. Add the transcript via settings
3. Transcript should be uploaded successfully
4. Transcript should render successfully on the studio
5. Publish the course
6. Video Block and transcript should render successfully on the LMS

B. Deleting transcript

1. After performing above steps, now delete the transcript from the video block.
2. Transcript should be deleted successfully and should stop appearing on the studio.
3. Publish the course.
4. Transcript should stop appearing on the lms as well

Testing on Content Library (Beta/V2):

C. Uploading transcript

1. Go to any content library > Units tab

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2. Create a new unit and video block as a content in the unit.

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3. Save the video and then edit the video again to upload/add the transcript. Transcript should be uploaded/added successfully.

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4. Video and transcript should be render successfully in the content library preview.

5. Go to any course, Add the block/unit from the library via 'Use unit from library' button

6. Transcript should render successfully on the studio

7. Publish the course transcript should render successfully on the studio

D. Deleting transcript

1. After performing above steps, now delete the transcript from the video block in the content library.
2. Transcript should be deleted successfully in the content library preview.
3. Sync the block in the course with the content library version.
4. Transcript should stop appearing on the course as well.
5. Publish the course.
6. Transcript should stop appearing on the lms as well

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All the fields of the Video XBlock Editor Window should be edited properly for both studio and content library.

Sample screen shot:

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Copy/Paste of the Video Block from Course to the Content Library and vice versa should work properly.

All testing has been done with in this PR sandbox.

[open-craft-grove]

Sandbox deployment successful 🚀
🎓 LMS
📝 Studio
ℹ️ Grove Config, Tutor Config, Tutor Requirements